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Am stuck on 20D, 5, 4
S-----/---B
The clue is Liquid (black) in small vault whence pong emanates
Could the second word be 'tomb'?

Also stuck on 25AC, (10)
Trouble after an invention puts of Tesla's foremost supporter
-------ADO
It can't be afficionado because it doesn't fit.

Your help appreciated as ever

Aficionado ?

Stink bomb.

It is AFICIONADO - An Invention = A FIC(t)ION (Puts off T(esla's) foremost + ADO (Trouble)

Thank you very much. My spelling is not as good as I thought.
Merry Christmas (but likely to be on here again before Xmas).

STINK BOMB - Liquid = INK + B(lack) inside S(mall) TOMB (Vault)