I enjoyed this, thank you Aardvark.

| Across | ||
| 1 | BYPASS | Work in theatre alongside father and sons (6) |
| BY (alongside) PA (father) and S S (son, twice) – an operating theatre | ||
| 4 | TISWAS | Dated model, holding back a state of excitement (6) |
| SAW (dated, romantically) and SIT (model) all reversed (holding back ?) | ||
| 8 | ANARCHY | Some disturbed by roguish lawlessness (7) |
| ANY (some) contains (disturbed by) ARCH (roguish) | ||
| 9 | ADMIRER | Notice bog close to extractor fan (7) |
| AD (notice) MIRE (bog) extractoR (closing letter of) | ||
| 11 | MUSICAL BOX | Perhaps Oliver or Annie scrap noisy old toy (7,3) |
| MUSICAL (Oliver or Annie perhaps) then BOX (scrap) | ||
| 12 | TUNA | Fish and quinoa regularly served on time (4) |
| qUiNoA (regularly served) following (on) T (time) | ||
| 13 | BLITZ | Surge of intense activity brightened boring business, one conceded (5) |
| LIT (brightened) inside (boring) BiZ (business) missing (conceding) I (one) | ||
| 14 | LISTENER | Person in audience to record Frenchman backing (8) |
| LIST (to record) then RENE (a Frenchman, typical name of) reversed (backing) | ||
| 16 | LEAPFROG | Casual golfer welcomes annual round – jumpers are needed for this (8) |
| anagram (casual) of GOLFER contains (welcomes) PA (per annum, annual) reversed (round) | ||
| 18 | QUACK | Cry coming from Donald, possibly a charlatan (5) |
| double definition – Donal Duck | ||
| 20 | SHOO | Wrap up eggs and drive away (4) |
| SH (hush, wrap up) and OO (two eggs) | ||
| 21 | JETTISONED | Abandoned plane, reassembled on-site, departs (10) |
| JET (plane) then anagram (reassembled) of ON-SITE and D (departs) | ||
| 23 | EVIDENT | Short recording in medical department that can be seen (7) |
| VIDEo (recording, short) in ENT (Ear, Nose and Throat, hospital department) | ||
| 24 | UNAIDED | Diane moved into centre of Bude by herself (7) |
| anagram (moved) of DIANE in bUDe (centre of) | ||
| 25 | NORMAN | Golden castle maybe following new architectural style (6) |
| OR (golden) MAN (castle possibly, chess) follows N (new) | ||
| 26 | ADVENT | Present opening is after this period (6) |
| AD (present) followed by (…is after this) VENT (opening) – and see jeff @9 in the comments | ||
| Down | ||
| 1 | BANTU | Language graduate not missing old university (5) |
| BA (graduate) then NoT missing O (old) and U (university) | ||
| 2 | PORCINI | Curtailed piggy one’s mushrooms (7) |
| PORCINe (piggy, like a pig) then I (one) | ||
| 3 | SCHNAUZER | Dog training runs, each involving an unspecified number (9) |
| anagram (training) of RUNS EACH containing (involving) Z (an unspecified number) | ||
| 5 | INDEX | Alphabetical registry actually excluding editor on Times (5) |
| IN DEed (actually) missing ED (editor) then X (times) | ||
| 6 | WHISTLE | Inform the Catalan about supporting card game (7) |
| EL (the, in Catalan) reversed (about) follows (supporting, underneath) WHIST (card game) | ||
| 7 | STEINBECK | US writer’s drinking vessel supplied with running water (9) |
| STEIN (drinking vessel) with BECK (running water) | ||
| 10 | OBBLIGATO | Ex-pupil on bass got Ali to change musical accompaniment (9) |
| OB (old by, ex-pupil) on B (bass) and anagram (to change) of GOT ALI | ||
| 13 | BEETHOVEN | Composer extremely bothersome, repositioning the heater (9) |
| BothersomE (extreme letters of) then anagram (repositioning) THE and OVEN (heater) | ||
| 15 | SEQUINNED | Dicky needs to dress one of five kids in sparkly clothing? (9) |
| anagram (dicky) of NEEDS containing to dress QUIN (one of five kids) | ||
| 17 | PLODDER | One moves laboriously outside in Pontypool, wanting more rum (7) |
| PontypooL (outside letters) then ODDER (more rum) | ||
| 19 | AGONISE | Worry intensely since returning in London area (7) |
| AGO (since) then IN reversed (returning) and SE (London area) | ||
| 21 | JUNTA | Project written by American about new military government (5) |
| JUT (project) with (written by) A (American) contains (about) N (new) | ||
| 22 | ERECT | Raise stern of frigate reportedly destroyed (5) |
| frigatE (last letter, stern of) then RECT sounds like (reportedly) wrecked (destroyed) | ||
definitions are underlined
I write these posts to help people get started with cryptic crosswords. If there is something here you do not understand ask a question; there are probably others wondering the same thing.
Slight error in 23a. The short recording is VIDE(o). It’s also a pangram.
Thanks both.
I think that in 6d “about” is meant to indicate LE instead of EL.
Thanks for the corrections, as always. Fixed now.
I am a bit uncomfortable with ‘z’ being used as any number. In maths any letter or symbol can indicate an unknown number. Perhaps typically ‘x’ or ‘n’ might be used but really anything would work. Using ‘z’ in this way seems a bit arbitrary. That said, I really enjoyed the crossword. It was challenging but accurate.
diagacht@4. I think z is fine. I take the point that almost any letter or symbol or … can be used but z is the most common for an unknown complex number. Also polynomials in several variables often use x then y then z then w then who knows.
As a side issue, those who did Hamilton’s crossword yesterday may not have seen his comment on his ghost theme. Worth another look if you missed it.
Bah! My only error was TIZWAS for TIZWAS .I googled TIZWAS and it’s a synonym for ‘tizzy'(*TISWAS, sorry)
hovis@5. Thanks for the memory of polynominals from algebra class — I can still see the x, y, and z from my textbook problems. I did see Hamilton’s comment on yesterday’s blog — quite impressive. (As an aside, Hamilton’s on the US $10 bill!) Thanks Aardvark for the pangram — I suspected one early with QUACK and knowing I needed a “J” helped me with JUNTA.
Hovis – good point about z being the traditional name used for complex numbers, I had forgotten that. Regardless, z for number is one of those devices that have been used for so long that they are now part of the furniture, whether they are justifiable or not.
Thanks Aardvark and PeeDee. I got ADVENT not by parsing but as a cryptic definition. Present-opening time (Christmas) comes after Advent!
jeff@usa – I like it! I don’t know if Aardvark had this in mind but it is great explanation.
If Aardvark had left off “period” then it would have been an &lit: “Present opening is after this (6)”
Lovely puzzle with a pangram for icing.
Thanks Aardvark and PeeDee
Thanks Aardvark and PeeDee
A lot of charade type clues which were fun to piece together. Spent way too long looking for that rare fish species, the UNAT, until eventually closer reading put the T in the right spot.
A couple of new terms – never come across TISWAS and the term to ‘wrap up’ meaning to request someone to shut up was also unknown.
I wondered which Donald he was really thinking of when he composed 18a.
Finished with SCHNAUZER, BLITZ and that TISWAS.