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Okay I give up!
23ac. Fancifully impractical and donnish. (8)
--I-O-I-
4dn. Sunshine, tea and sympathy at last! (5)
M-T-Y (I think it's MATES, but can't parse it)
18dn. Old corrupt banking heads to leave office, quitting in disgrace. (7)
O-L---Y

4d matey - slang for my old mate, my sunshine. mate = tea + Y(last letter of sympathy)

18d obloquy

23 ac is Quixotic as in "fancifully impractical" and I suppose Don as in Spanish Mr

4d is matey y is the last letter of sympathy but I cannot see Mate although there is a partial anagram of tea

18d must be obloquy but apart from O = old I cannot see the rest

I am sure others clever than me will be able to help!

23a quixotic? as in don quixote?

why does mate = tea

and what about the word play for obloquy

Thanks to both of you :0)
Don't get Tea= Mate though!

maté - en.wikipedia.org/wiki/Mate_(beverage)

and what about "obloquy" word play!

I have it

o = old
buy = corrupt
banking ie around the first letters of leave office quitting = loq
o b loq uy