Fall apart, having won kitty with nothing in (2,2,3)
I believe the answer is:
go to pot
'fall apart' is the definition.
'won kitty with nothing in' is the wordplay.
'won' becomes 'got'.
'kitty' becomes 'pot' ('pot' can be a synonym of 'kitty').
'with' is a charade indicator (letters next to each other).
'nothing in' becomes 'o' (I've seen this in other clues).
'pot' after 'o' is 'opot'.
'got'+'opot'='GO TO POT'
'having' is the link.
(Other definitions for go to pot that I've seen before include "Become ruined" , "Deteriorate through neglect" , "Deteriorate completely - ready to be cooked?" , "Tea bags will" , "Fall into neglect" .)