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Solution to 17D 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 answer, if not solved by 1 PM.
ACROSS
8 Resolve rifts in the beginning (5) FIRST*
9 Ill-famed Ohio university riots on? Terrible (9) NOTORIOUS {O+U+RIOTS+ON}*
10 Letters from vendor seeking support (7) ENDORSE [T]
11 Observe from a tunnel (7) EXAMINE {EX}{A}{MINE}
12 Samples of ground spices checked by staff (9) SPECIMENS {SPECI{MEN}S*}
14 Suggested rewriting name with title essentially (5) MEANT {NAME*}{tiTle}
15 Keep notice dividing plot, say near lake (7) CITADEL {AD} in {(~site)CITE}{L}
18 Presents meetings covering extremities of operation (7) DONATES {D{Op...oN}ATES}
19 It's me arranging articles (5) ITEMS*
20 Shift coach missing international game (9) TRANSPORT {TRAiN}{SPORT}
24 King in fury beheaded soldiers (7) EMPEROR {tEMPER}{OR}
25 Sailor buys objects (7) TARGETS {TAR}{GETS}
27 Police officer in park probing area (9) INSPECTOR {IN}{S{P}ECTOR}
28 Most mock at English marks (5) SCORE {SCORn}{E}
DOWN
1 Submits cases without introduction (6) OFFERS cOFFERS
2 Newly-wed crossing grand arch (6) BRIDGE {BRID{G}E}
3 Move prison (4) STIR [DD]
4 Anxious son rejecting ice-cream, say (8) STRESSED {S}{DESSERT<=}
5 Queen with team about to enter camps for therapies (10) TREATMENTS {T{RE}{TEAM*}ENTS} (Correction - {T{R}{TEAM*}ENTS} - See comments)
6 Ruling party getting short time worker (8) DOMINANT {DO}{MIN}{ANT}
7 Mule carrying excellent, old fire-proof material (8) ASBESTOS {AS{BEST}{O}S}
13 Rust inside abandoned factories (10) INDUSTRIES*
15 Institute restrained by erratic absurd rules (8) CRITERIA {I} in {ERRATIC}*
16 Encroachment in health resort breaking lock (8) TRESPASS {TRE{SPA}SS}
17 Free time for boy? Can read and write (8) L?T?R?T? (Addendum - LITERATE LI(+t-b)TERATE - See comments)
21 Change early theory now and then (5) ALTER {eArLy+ThEoRy}
26 Danger of reckless skier losing point (4) RISK SKIeR*
Reference List
Ohio = O, University = U, From = EX, Notice = AD, Lake = L, International = I, Soldiers = OR, Sailor = TAR, Park = P, English = E, Grand = G, Son = S, Queen = R, Party = DO, Time = T, Boy = B, Old = O, Point = E