Chat with drink is a hit (6,5)
I believe the answer is:
rabbit punch
'a hit' is the definition.
(I've seen this before)
'chat with drink' is the wordplay.
'chat' becomes 'rabbit' (I've seen this before).
'with' says to put letters next to each other.
'drink' becomes 'punch' (punch is an alcoholic drink).
'rabbit'+'punch'='RABBIT-PUNCH'
'is' is the link.
(Other definitions for rabbit punch that I've seen before include "Blow to back of neck" , "It may knock you out" , "Sharp chop to the back of the neck" , "hit" , "What causes a pain in the neck" .)