Kitty in retro blouse? (3)
I believe the answer is:
pot
'kitty' is the definition.
(both can mean a shared fund)
'retro blouse?' is the wordplay.
'retro' says the letters should be written backwards (retro is Latin for 'backwards').
'blouse?' becomes 'top' (blouse is a kind of top).
'top' backwards is 'POT'.
'in' acts as a link.
(Other definitions for pot that I've seen before include "It sometimes calls the kettle black" , "Receptacle" , "Trophy; kitty" , "...Karenina(Tolstoy)" , "Cannabis; sink (snooker)" .)