No 13838, Thursday 13 Apr 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.

ACROSS

8   "Sign record, Oscar" (4) LOGO {LOG}{O}

9   Authority to cook soya after commencement of summer (3-2) SAY-SO {SOYA}*<=>{Su...r}

10 Send out wrong time (4) EMIT*

11 Extraordinary cost, including one million for comedy show on television, for example (6) SITCOM {S{1}TCO*}{M}

12 Entered "I own tent" wrongly (4,4) WENT INTO*

13 Scamp goes around and does better (8) IMPROVES {IMP}{ROVES}

15 Immediately, champ collected hundred (2,4) AT ONCE {A{TON}CE}

17 Show type of American visa in place of egress (7) EXHIBIT {EX{H1B}IT}

19 More even praise (7) FLATTER [DD]

22 Pressing university rector and man (6) URGENT {U}{R}{GENT}

24 Man clues wrongly for personification of America (5,3) UNCLE SAM*

26 Laconic team leader adjusts curtain (8) TACITURN {Team}{CURTAIN*}

28 Advertisement in European capital for waterproof enclosure for antenna (6) RADOME {R{AD}OME}

30 Sink one's teeth into bits of bread in the evening (4) BITE Acrostic

31 Remove masks from mess jacket, crumple and throw out (5) EJECT {mEss+JaCkET}*

32 River having zero evaporation at first? (4) NILE {NIL}{Ev...n}

DOWN

1   Irritated patriot throwing out tar's hat (4) TOPI PatrIOT*

2   To some extent, deacon certifies solo musical compositions (8) CONCERTI {deaCON+CERTIfies}

3   Author Mao is worried on 3rd of November (6) ASIMOV {MAO+IS}{noVe...r}

4   Treatment for cleaning optical organ? Nonsense! (7) EYEWASH {EYE}{WASH}

5   Draw everyone behind New Hampshire's community building (4,4) TOWN HALL {TOW} with {ALL}<=>{NH}

6   Wrongly tax income without TAN in country (6) MEXICO {taX+InCOME}*

7   Present digital file format before time (4) GIFT {GIF}{T}

14 Around 9, setter gets right kitchen appliance (5) MIXER {M{IX}E}{R}

16 Revolutionary Los Angeles pincer (5) CHELA {CHE}{LA}

18 Nut rides haphazardly and barges in (8) INTRUDES*

20 Gradient is designed for travelling on foot (8) TREADING*

21 Country has no jailer (7) ?U?N?E? (Addendum - TURNKEY {TUR{N}KEY} - See comments)

23 Amended text, formulating diet by volume (6) EDITED Letter Bank (Addendum - {DIET*}{ED} - See comments)

25 Container containing union leader and churchman (6) CURATE {C{Un..n}RATE}

27 In the middle of logjam, I dither to some extent (4) AMID [T]

29 I'm back with large cocktail and baby food! (4) MILK {IM<=}{L}{cocK}

Reference List

Oscar = O, Million = M, University = U, Rector = R, Digital file format = GIF, Time = T, Right = R, No = N,  Large = L