The extra letters in clues for the unjumbled entries (and 17dn) spelt “anagram; Myzskowski”. The central 4×7 area of the grid was encoded using the Myzskowski transposition cipher with ANAGRAM as the keyword. Decoding the cipher text, which required resolving the ambiguous placement of E and P in rows 7 and 9, gave “Transposition Cipher by Serpent”, the puzzle’s true byline.
Conventions: * = anagram, < = reversal
| No | Extra letter | Answer | Explanation |
|---|---|---|---|
| Across | |||
| 1 | t(A)ints | MARIONETTE | ((g)O(v)E(r)N(m)E(n)T (t)I(n)T(s) R(e)A(l)M) * |
| 9 | ra(N)ge | SPIREA | SPA around IRE |
| 10 | (A)new | MIEN | IE in (M + N) |
| 11 | (G)rand | DIVERSE | DIVES around R + E(vent) |
| 14 | PRACTISE | PRISE around ACT | |
| 15 | TOUGHENING | (HUGE GIN + TONIC − IC(e)) * | |
| 16 | BARRENS | homophone of BARONS | |
| 18 | ON-DIT | EDIT with ON for first letter | |
| 19 | TEPEE | (apartmen)T + ÉPÉE | |
| 22 | FACTORY | FACTOR Y | |
| 23 | PIROUETTES | (SET + TIP) < around ROUÉ | |
| 26 | ESCAROLE | (ESC + ROLE) around (C)A(esar)/(Caes)A(r) | |
| 27 | sho(R)t | SPORTED | (TOP + DRES(s)) * |
| 28 | (A)bounds | ETCH | EH around T(raffi)C |
| 29 | ar(M)y | APIARY | A + PI(t) + ARY |
| 30 | (M)en | RESENTMENT | EN in REST + MET around N |
| Down | |||
| 2 | wear(Y)ing | APING | AP + IN + G(ranta) |
| 3 | BITTERN | BIT + TERN | |
| 4 | SCENARIO | (IRON CASE) * | |
| 5 | PAINS | SPAIN with first letter moving down | |
| 6 | ENMESH | ME(ssia)EN * + SH | |
| 7 | incorporate(S) | TEACUP | (incorpora)TE ACUP(uncture) |
| 8 | (Z)one | ENGENDERED | (GERRYMANDERED ONE) * − (R + MAYOR) * |
| 12 | lin(K)ed | RIGHTFUL | RUL(e) around FIGHT with F moved down |
| 13 | (O)pinions | TEETOTALER | (A LOT) * in TEETER |
| 14 | spa(W)ns | ROADSTER | ROSTER around AD |
| 17 | (S)tory | PROPERTY | PROSPER − S(uggest) + T(or)Y |
| 20 | EMPTIER | (E + TIER) around (M + P) | |
| 21 | ris(K)ing | LOCATE | MATE with COL < for M |
| 22 | SHORES | SHOE’S around R | |
| 24 | PIANO | (o)P(t)I(m)A(l) + NO | |
| 25 | (I)ran | STERN | R(an) in NETS < |