A(nother) Game of 1 by Glow-worm

Puzzle explanation

Letter substitutions in wordplay established a mapping from the letters of DAVENPORT to those of TIC-TAC-TOE. Letters from XOX-XOX-XOO were then to be added with the corresponding letters of DAVENPORT in the central nine cells, to produce the finished game of Noughts and Crosses. The diagonal winning line led to jumbles of CORIN and ANITA or TANIA. As "the boy lost" (from the perimeter cells), the winner was ANITA/TANIA.

Clue explanations

Conventions: * = anagram, < = reversal

No Answer Explanation
Across
9 UNION BUNION − B(ruising)
12 A(V)ID A(T)ID = CARYATID − CARY
14 JOCULAR J + OCULAR
15 AMORINO A(rrow) + MINOR * + 0 (love)
16 K(A)TRINA K(I)TRINA = (TRICKING A − C(onservative) G(randee)) *
17 PREPONE EP in PRONE
18 (O)STIA (E)STIA = (v)EST I A(cquired)
19 ISERE (FISHERIES − FISH) *
20 OCCASION(E)RS OCCASION(O)RS = (CROCS + A POISON − P) *
21 SUDS ((Everglade)S’ DUS(k)) <
23 LOT LOTUS − US
24 MANOR homophone of MANNER
28 S(P)AM S(T)AM = (antihi)STAM(ine)
30 DINE ENID <
31 DERM (Kid)DERM(inster)
33 LOES LOES(s)
34 PATNA (PATNA + IS TO) = ANTIPASTO *
36 KED NAKED − NA
37 ALUM A + L(o)U(d) + M
41 Y(D)RED Y(C)RED = CYDER *
44 CO(N)GA CO(T)GA = CO + T(wist) G(yrate) A(nd)
46 RONDEAU R(ossetti) + ON + D + EAU
47 MANITOU MUTATION * − T
48 HASTING HASTING(s)
50 UPSTART STAR in PUT *
51 (R)ICH (A)ICH = (Dub)AI CH(allenger)
52 PIN(T)O PIN(C)O = COPING * − G(room)
Down
2 HOUR HAND HOUND around RHA
3 SPANS SNAP < after S(torm)
4 MAP-PIN PP in MAIN
5 LIME GREEN (ME REELING) *
6 IDO I DO
7 TWINE WINE after T (cross-section of T-bar)
8 LONER LONDONER − DON
10 NO ALCOHOL NOA(h) + L + CO + HOL
11 CRATON RAT in CON
18 OSMIC (h)O(u)S(e)M(a)I(d) + C(arbolic)
22 DAVENPORT (DAVE + PORT) around N
25 ANTIGENIC (I CAN GET IN) *
26 OVA O(n) V(apid) A(nchovies)
27 BRAGA BA around RAG
29 PAKISTANI (TAKING PAINS − NG) *
32 MELLITIC ELLI(e) in (M + TIC(k))
35 TIN MUG TING around MU
38 MENTO MENTO(r)
43 ROSPA RO + SPA
45 GAPPY GAY around PP
49 IRK (k)IRK
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