Talk and drink - it's a hit (6,5)
I believe the answer is:
rabbit punch
'talk' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'drink it's a hit' is the wordplay.
'drink' becomes 'rabbit' (I can't justify this - if you can you should give a lot more credence to this answer).
'it's a hit' becomes 'punch' (I've seen this before).
'rabbit'+'punch'='RABBIT-PUNCH'
'and' is the link.
Can you help me to learn more?
(Other definitions for rabbit punch that I've seen before include "Blow to back of neck" , "hit" , "What causes a pain in the neck" , "It may knock you out" , "Sharp chop to the back of the neck" .)