Concede: 'I have to down drink'? On the contrary (4,2)
I believe the answer is:
give in
'concede 'i have to down drink'? on the contrary' is the definition.
I can't tell whether this defines the answer.
'concede 'i have to down drink'? on' is the wordplay.
'concede' becomes 'give' (I've seen this before).
'have' says to put letters next to each other.
'to down drink'? on' becomes 'n' (I can't justify this - if you can you should believe this answer much more).
'give'+'i'+'n'='GIVE IN'
(Other definitions for give in that I've seen before include "'Yield (4,2)'" , "Yield, submit" , "Capitulate" , "Cease arguing/fighting" , "Cease arguing; submit" .)