GOZO kicks off the week…
A fun puzzle, with some nifty surfaces.
Thanks GOZO!

ACROSS
1. The sky full of rooks? Visionaries’ ideals (7,2,3,3)
CASTLES IN THE AIR
Double (cryptic) definition
9. Private letter container with post and spar (7)
MAILBOX
MAIL (post) and BOX (spar)
10. Literary festival town collecting listeners’ gossip (7)
HEARSAY
HAY (literary festival town) collecting EARS (listeners)
11. Some fanciful tradtionalist – hardly! (5)
ULTRA
[fancif]UL TRA[ditionalist] (some) &lit
12. Veronica having drug. Gracious! (9)
SPEEDWELL
SPEED (drug) + WELL (gracious!)
13. Delivery from popular lively up-to-date person (9)
INSWINGER
IN (popular) + SWINGER (lively up-to-date person)
15. The right one stopped to get up late (3,2)
LIE IN
LIEN (right), I (one) stopped
16. You once received records of evidence of Fido’s excitement (5)
YELPS
YE (you, once) received LPS (records)
18. Sea-life centres with canoe wrecked by field, we’re told (9)
OCEANARIA
(CANOE)* (*wrecked) by "area" = ARIA (field, "we're told")
20. New Englander, say, always around at the back (9)
EASTERNER
EER (always) around ASTERN (at the back)
23. Elementary book academy faithfully reproduced (5)
BASIC
B (book) + A (academy) + SIC (faithfully repoduced)
24. Informal conference about the Inca (5-2)
TEACH-IN
25. Where a golf-ball ends up with difficulty (2,1,4)
IN A HOLE
26. Online extra involving ten mathematical characters (5,10)
EMAIL ATTACHMENT
(TEN MATHEMATICAL)* (*involving characters)
DOWN
1. Council facility U? (9,6)
COMMUNITY CENTRE
Reverse cryptic, U being the centre of COMMUNITY
2. Islamic worshippers at camping locations, accepting greeting (7)
SHIITES
SITES (camping locations) accepting HI (greeting)
3. Two overlapping signs at lending outlets (9)
LIBRARIES
LIBRA and ARIES (two signs, overlapping)
4. Crickets scores in disarray when partnering sevens (5)
SIXES
at SIXES and sevens (disarray)
5. Unlimited extent of the gender problem (3,6)
NTH DEGREE
6. Treasure from wandering tribe is spoken of (5)
HOARD
"horde" = HOARD (wandering tribe, "spoken of")
7. Australia tried enthusiastically removing England’s openers – harsh! (7)
AUSTERE
AUS (Australia) + T[ried] E[nthusiastically] R[emoving] E[ngland] (openers)
8. Arranged Rain Dance only at St Andrews (5,3,7)
ROYAL AND ANCIENT
(RAIN DANCE ONLY AT)* (*arranged)
14. Food plant crushed by overturned barrel (9)
GROUNDNUT
GROUND (crushed) by (TUN)< (barrel, <overturned)
15. Began swimming in lake in Californian city (4,5)
LONG BEACH
(BEGAN)* (*swimming) in LOCH (lake)
17. Callas recollected a famous opera venue (2,5)
LA SCALA
(CALLAS)* (*recollected) + A
19. Knight rejected the only breadcrumb cake (7)
RISSOLE
(SIR)< (knight, <rejected) + SOLE (the only)
21. Merman giving some discreet help (5)
ETHEL
22. Educated woman consumes a cucumber dish (5)
RAITA
RITA (educated woman) consumes A
Nothing too complex here although I did struggle a bit with NTH DEGREE. I was interested that I have now encountered the “overlapping” device (3 Down) twice in a week, having never seen it previously. Thanks Gozo and Teacow
If anyone else is having deja vu over the LIBRARIES clue, Vulcan had an almost identical clue on March 24, ‘They lend two overlapping signs’.
Thanks for the blog , very good set of clues , neat and lots of variety . For INSWINGER I was glad to see the original meaning of swinger , remove the hyphens and we have the modern version which I do not like .
Liked CASTLES IN THE AIR, ULTRA (CAD. A little short of being &lit?), INSWINGER (For the ‘lively …person’), NTH DEGREE and GROUNDNUT.
IN A HOLE
I think the def is ‘with difficulty’ (looks closer than difficulty).
SIXES
Is it okay to define SIXES as ‘crickets scores’ (as opposed to cricket scores)?
Thanks Gozo and Teacow
PS: Hovis@2 Yes. I remember that clue.
I agree with Roz@3 that it was a set of neat clues with lots of variety. I also liked Roz’s “remove the hyphens” comment. I agree with KVa on SIXES and IN A HOLE
The puzzle contained a few words that were new for me, but it was way within my tolerance level. My favourites were ROYAL AND ANCIENT, ETHEL, YELPS.
Thanks Gozo and Teacow
A very enjoyable puzzle, lots to like, ‘though the clues for 25(ac) IN A HOLE, and 4(d) SIXES seem slightly awry to me.
More than compensated, by COMMUNITY CENTRE at 1(d); and NTH DEGREE 5(d). A clever reverse cryptic and a trappy choice for an anagram.
Nice to see ETHEL Merman getting a namecheck, she was in my favourite film as a kid…”It’s A Mad,Mad,Mad,Mad World”. Which sums up the world today, but not this crossword, which was very smart indeed.
Thanks to Gozo & Teacow
Enjoyed this one though nth degree was a struggle.
“A fun puzzle with some nifty surfaces” – sums it up nicely for me.
NTH DEGREE was one of the last clues I solved – it could well have been the very last. Early in the piece, I went thought all the vowels that could go in the space between N & H – obviously with little success. I think I needed all the crossers and some thinking time to finally crack it