Solution to 6D 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
8 Loots guns (6) RIFLES [DD]
9 Kids cried hard, jumping, chewing piece of lollipop with honey essentially (8) CHILDREN {CRIED+H}* over {Lo...p} with {hoNey}
11 Defilement of instrument rewriting on it (9) VIOLATION {VIOLA}{ON+IT}*
12 One scoundrel with drug is furious (5) IRATE {1}{RAT}{E}
13 Old wager returning inside retreat with small laptops (9) NOTEBOOKS {O}{BET}<= in {NOOK}{S}
16 Gas contained in volcano gradually coming back (5) ARGON [T<=]
17 Grave words in record by Thai president is altered (7) EPITAPH {EP}{THAI+P}*
19 Chef eventually drops buds (7) FLOWERS {cheF}{LOWERS}
21 Notices cycles in fish (5) SHARK (+s)SHARK(-s)
24 Nausea, disoriented European abandoned steam bath (5) SAUNA NAUSeA*
25 Size fixed, game unit designed finally (9) MAGNITUDE {GAME+UNIT+d...eD}*
27 Painter using simulator not ordinary (8) MURALIST {SIMULAToR}*
28 Spread samosas, plates right away with lemon for starters (6) SPRAWL Acrostic
DOWN
1 Five entering Ripon building near church area (8) PROVINCE {PRI{V}ON*}{CE}
2 Struggle of English force opening castle (6) EFFORT {E}{Fo..e}{FORT}
3 Gamble with a Greek character (4) BETA {BET}{A}
4 Avoid bright star, hot chaps (4) SHUN {S{H}UN}
7 Indian ushering new bird trainee (6) INTERN {I}{N}{TERN}
10 Backlash of company controlled by wealthy, evading taxes from the beginning (8) RICOCHET {RI{CO}CH}{Ev...g}{Ta..s}
14 Leader of brigadier wants to include post for forces (10) BLACKMAILS {Br...r}{LACK{MAIL}S}
15 Harry argues engaging two females for voting right (8) SUFFRAGE {SU{FF}RAGE*}
18 Rush from extremely heavy rain maybe engulfing ancient city (2,1,5) IN A HURRY {HeavY+RAIN}* over {UR}
20 Note sly dude moving abruptly (8) SUDDENLY {N+SLY+DUDE}*
25 Reviewing contents of that same post (4) MAST [T<=]
26 Rogues banishing the Spanish in drives (4) IMPS IMPelS
Reference List
Hard = H, Drug = E, Old = O, Record = EP(Extended Play), President = P, Quietly = SH, European = E, Ordinary = O, Church = CE, English = E, Hot = H, Indian = I, Cross = T, New = N, Female = F, Note = N, Second = S, The in Spanish = EL