Solution to 12A 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.
Open for anyone to solve, if not solved by 1 PM.
ACROSS
7 That lady in a complex medical condition (6) HERNIA {HER}{IN+A}*
8 Spooner's instructions to batter and pummel minced beef? (8) MEATBALL (beat maul to meatball)
9 Transporter of stable beings? (8) HORSEBOX [CD]
10 Shabby wager about a state in India (4-2) BEAT-UP {BE{A}T}{UP}
13 Do these small broken pieces somehow endorse theism? (11) SMITHEREENS {SMITHEREENS+DO}*=ENDORSE THEISM [CA]
18 A fine and secure state (6) AFFIRM {A}{F}{FIRM}
20 Repudiate unfortunate ban on E Portal (8) ABNEGATE {BAN*}{E}{GATE}
22 Counter a mountaineer, say (6) SCALER (~scalar)
23 Damp date escapes for a bit of leftover modesty (8) HUMILITY HUMI(-d+l)LITY
24 Every now and then Mahomet procured cleaners in vehicles (8) MOTORCAR POS issue {MahOmeT+prOcuRed+CleAneRs}
25 Forlorn and bewildered, Noel's extremely laggardly (6) LONELY {NOEL*}{La...lY}
DOWN
1 Whoa! Eros (Olympian-God) smuggled an atomiser (7) AEROSOL [T]
2 Unit of measurement's converted? Not grams (8) ANGSTROM*
5 Confused about small submarines (1-5) U-BOATS {ABOUT}*{S}
6 Chapters about the French Applications (7) CLAUSES {C}{LA}{USES}
8 Trash poem To hamper? Incongruous literary device! (5,8) MIXED METHAPOR {TRASH+POEM}* [RA] There's an extra S in the fodder See comments
14 Plant trees around malls, airports, restaurants and cemented kerbs from the beginning (8) TAMARACK Acrostic
16 Secret sauce from unknown industry's restricted (1,6) X FACTOR {X}{FACTORy}
17 Section of Royalty let a Tsar make a comeback in August (7) STATELY [T<=]
19 Denied opening large toilets in accommodations for cold folks? (6) IGLOOS {bIG}{LOOS}
21 Specifically chap returns to city in England (6) NAMELY {MAN<=}{ELY}
Reference List
Chase = WOO, Fine = F, Date = D, Small = S, About = C, The in French = LA, Unknown = X