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Held up on a few.
21a University servant backed supreme deity (6) ?C?EO?
4a Joke about one held by card (8) ?ORT?IS?
12d ...following call about yard burning (6) F??I??
23a Corps direct account for Turkish Govenor (6) ??I???
The clues may be normal, have a misprint in the definition or have no definition.
As always, any gentle hints appreciated.

4a Joke about one held by card (8) ?ORT?IS?

rot=joke
tose=card

21a No definition 3-letter uni student reversed + 3 letter deity, The C is wrong.

4a No definition - obvious when you get the theme.

12d burning = def, Following + word for call around yard.

23a Corps + direct + account = Turkish governor.

Thanks Nick & Ixion - this has got me going again