Jaw cold immediately after ice-lolly (6)
I believe the answer is:
confab
'jaw' is the definition.
(both can mean to chat)
'cold immediately after ice-lolly' is the wordplay.
'cold' becomes 'c' (eg on taps).
'immediately after' becomes 'on' ('on' can mean 'after' or 'following' in time).
'ice-lolly' becomes 'fab' (Fab is a brand of ice lolly).
'c'+'on'+'fab'='CONFAB'
(Other definitions for confab that I've seen before include "Chat (informal)" , "Chatter" , "gossip" , "jaw" , "Chat (colloquial)" .)