No 13910, Thursday 06 Jul 2023, Incognito

Solution to 21D 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

1   Coir buttons may result in hindrance (11) OBSTRUCTION*

9   Instrument with cutting edge technology Shiraz orchestra possessed (5) RAZOR [T]

10 Suddenly American students get one hundred at church (3,2,4) ALL AT ONCE {A}{LL}{A}{TON}{CE}

11 Screws and bolts for example (10) FASTENINGS [CD]

12 Female bird or chicken? (4) FOWL {F}{OWL}

13 President has right equipment for shaving (5) BRUSH {B{R}USH}

15 Prisoner of war consumes sheep prepared for fairground entertainment (8) PEEPSHOW {P{SHEEP*}OW}

17 Southern Cross is transformed into cutting implement (8) SCISSORS {S}{CROSS+IS}*

19 Travelling bikers leaving island may park at these places (5) KERBS BiKERS*

22 It can take the form of speed bumps during a close shave! (4) ACNE [CD]

23 Vet a fresh preparation containing a cosmetic liquid used by gentlemen (10) AFTERSHAVE  {VET+A+FRESH}* over {A}

26 Pacific Indian tribes may smoke this (5,4) PEACE PIPE [CD]

27 Well informed fight between America and Europe (5) AWARE {A}{WAR}{E}

28 Bend harbours stench spreading after one in washing area (7,4) KITCHEN SINK {KINK} over {1}{STENCH*}

DOWN

1   Gives out English quarter after rejection by menagerie (5) OOZES {E}{S}<=>{ZOO<=}

2   During chess move, Indian shrieks (9) SCREECHES {S{CREE}CHES*}

3   Funnily I adore band equipment organiser (6) ROADIE*

4   Crush log once to make make perfumery product (7) COLOGNE*

5   I order tasty appetisers for starters. Just a small quantity... (4) IOTA Acrostic

6   OK, nor hens slaughtered are prohibited to be consumed (3-6) NON-KOSHER*

7   Ready to assemble parts may be profitable when designed with toil (6) PREFAB (prefab+toil=profitable) [CA]

8   Chap dropped with a shout (6) FELLOW {FELL}{OW}

14 After marriage, sailor gets British flag (5,4) UNION JACK {UNION}{JACK}

16 South Asian pianist composed, including a khayaal at first (9) PAKISTANI {P{A}{Kh...l}ISTANI*}

17 Ruffians party aboard ship (6) SCAMPS {S{CAMP}S}

18 Dashing Royal Air Force flier, for example (7) RAFFISH {RAF}{FISH}

20 Get angry... perhaps before sighting Amber at a traffic signal (3,3) SEE RED [DD]

21 Humiliate setter having some ale in study (6) ?E?E?N (Addendum - DEMEAN {DE{ME}{Ale}N} - See comments)

24 Sailor takes a bite of chicken and cocktail astern (5) ABACK {AB}{A}{Ch...n}{cocK}

25 After 10, start to tidy wigwam (4) TENT {TEN}{Tidy}

Reference List

American = A, Student = L, Hundred = TON, Church = CE, Female = F, Right = R, Southern = S, Island = I, America = A, Europe = E, English = E, Quarter = S(South), Sailor = JACK, AB, Ship = SS