Kitty after second little bit (4)
I believe the answer is:
spot
'little bit' is the definition.
(thesaurus)
'kitty after second' is the wordplay.
'kitty' becomes 'pot' (both can mean a shared fund).
'after' means one lot of letters go next to another.
'second' becomes 's' (common abbreviation).
'pot' put after 's' is 'SPOT'.
(Other definitions for spot that I've seen before include "Notice; skin blemish" , "Fix" , "Mark, dot" , "Informally, catch sight of" , "Notice - stain - pick out" .)