Came across nothing in the kitty (5)
I believe the answer is:
found
'came across' is the definition.
('find' can be a synonym of 'come across')
'nothing in the kitty' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'in the' indicates putting letters inside.
'kitty' becomes 'fund' (fund or money for a particular purpose).
'o' placed within 'fund' is 'FOUND'.
(Other definitions for found that I've seen before include "Start" , "Launch" , "To bring into being; cast" , "Establish" , "Discovered" .)