Quiet place to buy another drink? (7)
I believe the answer is:
retreat
'quiet place' is the definition.
'another drink?' is the wordplay.
'another' becomes 're' (I've seen this in other clues).
'drink?' becomes 'treat' (I can't justify this - if you can you should give a lot more credence to this answer).
're'+'treat'='RETREAT'
'to buy' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
(Other definitions for retreat that I've seen before include "The Priory, say" , "Pull back" , "place for meditation" , "What cowards might do" , "retirement" .)