Discovered nothing in kitty (5)
I believe the answer is:
found
'discovered' is the definition.
(to discover is to find)
'nothing in kitty' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'in' is an insertion indicator.
'kitty' becomes 'fund' (fund or money for a particular purpose).
'o' put within 'fund' is 'FOUND'.
(Other definitions for found that I've seen before include "Start" , "Establish" , "Launch" , "To bring into being; cast" , "Discovered" .)