Relationship established with talk and drink? (7)
I believe the answer is:
rapport
'relationship' is the definition.
(I've seen this before)
'talk and drink?' is the wordplay.
'talk' becomes 'rap' (rapping is a kind of talking).
'and' is a charade indicator (letters next to each other).
'drink?' becomes 'port' (port is a kind of drink).
'rap'+'port'='RAPPORT'
'established with' is the link.
(Other definitions for rapport that I've seen before include "Mutual harmony and affinity" , "Sympathetic relationship" , "Close and harmonious relationship" , "Sympathetic understanding" , "Harmonious and understanding relationship between people" .)