Thank you to Guy. Some nice surfaces here. Definitions are underlined in the clues.
Across
1. Submarine that’s German and Irish and American (8)
UNDERSEA : UND(German for “and”) + ERSE(the Irish Gaelic language) plus(and) A(abbrev. for “American”).
Defn: …/underwater.
6. Fine being sore after exercise class (6)
PEACHY : ACHY(sore/suffering from continuous dull pain, as you might be after exercising) placed after(after) PE(abbrev. for “physical education”/exercise class in school).
Defn: …, in North American slang.
9. Say, borstal pupil’s denial retracted after pressure? (6)
PRISON : Reversal of(… retracted) [ NO, SIR ](a pupils’ denial as said to a teacher) placed after(after) P(symbol for “pressure” in physics).
Defn: An example of which/say, is the borstal, a custodial institution for young offenders.
10. Structure on a pitch Rooney’s inside, most likely (3,2,3)
TEN TO ONE : TENT(a structure on a pitch/a cloth shelter that you pitch/set up) + inner letters of(…’s inside) “Rooney“.
Defn: The odds for something most likely to happen.
11. Censor government report (4)
BANG : BAN(to censor/to forbid) + G(abbrev. for “government”).
Defn: A …/sudden loud noise.
12. Exhibitor fashioned arty base for nude figure (6,4)
SHOWER TRAY : SHOWER(an exhibitor/one who shows) + anagram of(fashioned) ARTY.
Defn: A base/something to stand on for a nude figure/person, in this case one taking a shower.
14. Friend shortly runs single rounder after children (8)
MATRONLY : “mate”(a friend/companion) minus its last letter(shortly) + R(abbrev. for “runs” in cricket scores) + ONLY(single/solitary).
Defn: The unflattering description of one who is rounder/of heavier build after having children. Or is it the description of one who rounds up/tends to children in an institution? – but, if that were so, the clue gives no indication that the solution should be an adjective.
16. One egg put on for the whole family (4)
UNIT : NIT(egg of a louse) plus(put on) U(abbrev. for “universal”, the classification of film certified as suitable for viewing by everyone, including the whole family).
18. Hill-dweller taken aback by English mountain (4)
ETNA : Reversal of(… taken aback) ANT(a dweller of an anthill) placed after(by) E(abbrev. for “English”).
Defn: … in Sicily.
19. Mark round glass left by sediment from Spooner’s wine? (8)
RIESLING : Spoonerism of(… from Spooner) [ “lees”(sediment from wine) that has left a “ring”(a mark round a glass, a wineglass, say) ].
Defn: A dry white … from Germany.
21. Prince Charles collects amateur and dreadful china for fun (10)
PLAYFELLOW : POW(abbrev. for the Prince of Wales, currently Prince Charles) containing(collects) [ LAY(amateur/not professionally qualified) + FELL(dreadful/terrible) ].
Defn: A mate/china to play with/for fun.
22. Tree-trunk Jack climbs for acorns, say (4)
MAST : Double defn: 1. That formerly constructed from a tree-trunk, which a Jack/a seaman might climb on board a ship; and 2nd: Animal feed which could/say be made from, or including, acorns.
24. Here goes old Morris for example, heading west (8)
GERONIMO! : Reversal of(…, heading west, in an across clue) [ O(abbrev. for “old”) + MINOR(a model of car from Morris Motors) + EG(abbrev. for “exempli gratia”/for example) ].
Defn: An expression of excitement when, say, jumping from a great height:

26. Amazon creator’s cut, an extortionate sum (6)
RANSOM : “Ransome”(Arthur, an English writer of children’s books, which feature a dinghy called the Amazon) minus its last letter(…’s cut).
Defn: Sum of money paid for the release of a captive/sum paid for an act of extortion, “extortionate”, you might say. Also, an exorbitant sum as in “a king’s ransom”.
27. Grey animal swimming, a seal by the sound of it (6)
CYGNET : Homophone of(… by the sound of it) “signet”(a seal to authenticate a document).

28. Wrap up in warm layers when cycling (8)
ENSHEATH : [ HEAT(to warm/make hot) HENS(layers of eggs) ] with the last 3 letters moved to the front(when cycling).
Down
2. Some minor maiden? On the contrary! (5)
NORMA : Hidden in(Some) “minor maiden“.
Defn: Character in the opera of the same name, who is the major, not/on the contrary, a minor role, and who is a mother, not/on the contrary, a maiden.
3. Police state redeployment of army sergeant ain’t right (4,7)
EAST GERMANY : Anagram of(redeployment of) [ “army sergeant” minus(ain’t) “r”(abbrev. for “right”) ].
4. Wrong horse carries child up and down (8)
SINGSONG : SIN(a wrong/a misdeed) + GG(a child’s term for a horse) containing(carries) SON(one’s child).
Defn: Describing speech or voice with intonation or accent that goes …/alternately rising and falling rhythmically.
5. Creator of many plots, tho’ nearly no plot twists (7,8)
ANTHONY TROLLOPE : Anagram of(… twists) THO’ NEARLY NO PLOT.
Defn: Prolific English novelist.
6. Crack clear container for fruit (6)
PUNNET : PUN(a crack/joke using the meaning or sound of words) + NET(in terms of earnings, to clear/secure after all deductions).

7. Excitement at party with time flying (3)
ADO : “at” + DO(a party/a function) minus(with … flying) “t”(abbrev. for “time”).
8. National song Beethoven’s ninth has depended on (9)
HUNGARIAN : [ARIA(an operatic song) + 9th letter of(…’s ninth) “Beethoven“] placed below(has .. on, in a down clue) HUNG(depended/suspended from – though in rare usage).
13. Sell yellow tops to domestiques, equalising everyone on the Tour? (4,2,5)
TOUT LE MONDE : TOUT(to sell a ticket at higher than the official price) + LEMON(pale yellow colour) + 1st letters, respectively, of(tops to, in a down clue) “domestiques, equalising“.
Defn: “everyone” in the language of where the Tour de France is held.
15. Mary undressed like some dancing girls, perhaps revealing big arms (9)
ARTILLERY : “Mary” minus its 1st and last letters(undressed) + TILLER(… Girls, a popular dance troupe) + -Y(suffix added to a noun to signify that something has similar characteristics to/is like that which the noun refers to.
17. British prince is heading for retirement (8)
BEDWARDS : B(abbrev. for “British”) + EDWARD(a British prince, son of Queen Elizabeth II) + ‘S(contraction of is).
20. Determined to bear eleven sons, preferring those? (6)
SEXIST : SET(determined/fixed) containing(to bear) [ XI(Roman numeral for “eleven”) + S(abbrev. for “sons”) ].
Defn: …/favouring males, sons for example.
23. Carnivore stumped by grass (5)
STOAT : ST(abbrev. for “stumped” in cricket scores) plus(by) OAT(a wild grass related to the cultivated oat plant).
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25. Allow women to crack on (3)
OWN : W(abbrev. for “women”) contained in(to crack) ON.
Defn: …/to acknowledge/admit, as in “I own to having lied”.
What a compilation of clever clues from Guy. A slow start, admittedly, but plenty to get stuck into.
I had ticks all over the place but 13 was my favourite, closely followed by 12 for its definition.
Also liked 2’s ‘major’ woman (whose husband enjoys 5d – a nice, meaty anagram). Other standouts were 19’s Spoonerism and the wordplay for 4, 8 and 28. Probably more besides.
Just needed an online check to confirm the ‘dancers’ with big arms and the secondary meaning of a squirrel’s choice treat (22).
Thanks to Scchua and Grant.
I think this is number four for Guy and I haven’t found any of his/her puzzles easy, including this one. I was defeated by RIESLING and couldn’t parse UNIT or BEDFELLOW at the time of solving; as usual, obvious now.
Good fun too, with ticks against the double meaning for 2d, the ‘base for nude figure’ def and the complicated wordplay for TOUT LE MONDE. Best though was the ’rounder after children’ def; the Y chromosome must be protective!
Thanks to scchua and Guy
Ah, I see I’ve gone with a different version of 2d from our blogger. Open to interpretation, perhaps?
I agree that 14A is a bit insulting to women: much like “cherry” a few days ago.
As for 21A, I do not know this word but it is possibly “politically correct”: although “playmate” is also “gender neutral”.
Is 17D really a word? I’m about to go into my garage; am I “garagewards”?
Doesn’t 2D refer to John Major’s wife? As I think that Diane may be alluding to?
Very enjoyable, thank you Guy and scchua
My top favourite was 26a – I also like a Swallows and Amazons reference – and 22a
Didnt Rooney wera a 10 shirty?
Thanks for the blog, a lot of very clever clues. I agree with Diane and Peter about the Norma Major reference. BEDWARDS is not in Chambers but the clue is neat and the meaning is clear enough. I will pick out SHOWER TRAY for a great definition.
Hello Roz @7. I thought BEDWARDS was an odd word too so I looked it up afterwards. Strangely enough it is in my Chambers Dictionary app, but not in my hard copy (1994) edition.
Thanks WordPlodder, I only have the 93 edition and it was not in there , It could have been added to later paper editions.
Thanks Guy and scchua
BEDWARD and BEDWARDS are in my 1970s SOED.
Started very slowly and after only about a dozen solves in an hour abandoned ship. I should have known — Guy is on my “don’t attempt” list.
Quite challenging in places (although we rattled through the first few acrosses) but we made it in the end; last two in were SINGSONG and MATRONLY. We also stalled for a while on 26ac thinking – though we couldn’t see how – it must be a reference to a certain Mr Bezos.
We liked CYGNET (all birds are animals but not all animals are birds) and TOUT LE MONDE, but favourite was GERONIMO!
Thanks, Guy and scchua.
Too hard for me. Gave up at about 50%
What Geoff Down Under said.