No 12995, Thursday 23 Jul 2020, Incognito

Solution to 11A has been deliberately left unsolved and is to be answered only by a non-regular/novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.

ACROSS
7   Detest headgear having ear-flaps at first (4) HATE {HAT}{Ea...s}
8   Ammo vehicle is on mountain's continuous and elevated crest (9) CARTRIDGE {CART}{RIDGE}
10 Lounge around idly in British jacket (6) BLAZER {B{LAZE}R}
11 Non-vegetarian food given up by Adam? (5,3) S?A?E? ?I? (Addendum - SPARE RIB [DD] - See comments)
12 Essential existential support that one can find in one’s hand (8) LIFELINE [DD]
14 Brew fine US brew (6) INFUSE*
16 Many leaves fly around middle of March (7) SEVERAL {SEVE{maRch}AL}
18 Choke when mothers put son first (7) SMOTHER (+s)SMOTHER(-s)
21 Flying RAF ace’s canteen (6) CARAFE*
23 Revolutionary Yale brat's treachery (8) BETRAYAL*
25 Hangs awkwardly, I hear, high in Paris of the East (8) SHANGHAI {HANGS*}{HAI}(~high)
27 Friend in Indian Military Academy shows animal (6) IMPALA {IM{PAL}A}

29 Charlie mixes up signals, including fifty pseudonyms of pilots (4-5) CALL-SIGNS {C}{SIGNALS*} over {L}
30 God of War’s arms redesigned (4) MARS*

DOWN
1   Final lie about manicurist’s tool (4-4) NAIL-FILE*
2   In the beginning, George expressed excitedly with Zulu in an ancient language (4) GEEZ {Ge...e}{Ex...d}{Ex...y}{Z}
3   After tenth month, French king gets tax on movement of goods (6) OCTROI {OCT}{ROI}
4   Goes over religious symbols (7) CROSSES [DD]
5   Mao grins funnily at creature (8) ORGANISM*
6   In Eastern Europe, Director General gets advantage (4) EDGE {E{DG}E}
9   Gives out wrong time on Sunday (5) EMITS {TIME*}{S}
13 Endlessly enemy gets American injection (5) ENEMA {ENEMy}{A}
15 Arafat warns — includes a ruling on Islamic law (5) FATWA [T]
17 Gem produced by thy mates, perhaps? (8) AMETHYST*

19 On-line sellers’ transport earliest (1-7) E-TAILERS*
20 Reduce length of a spanner (7) ABRIDGE {A}{BRIDGE}
22 CO had organised for the specific purpose (2,3) AD HOC*
24 Desire fancy T-shirt (6) THIRST*
26 White or Blue African flower? (4) NILE [CD]
28 Coypu mandible holds big cat (4) PUMA [T]

Reference List
British = BR, Son = S, Charlie = C, Fifty = L, Zulu = Z, King in French = ROI, Eastern = E, Europe = E, Sunday = S, American = A