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