Bar in which to relax (6)
I believe the answer is:
lounge
I believe this clue is a double definition.
'bar' is the first definition.
(thesaurus)
'to relax' is the second definition.
(I've seen this before)
'in which' is the link.
(Other definitions for lounge that I've seen before include "Recline in a very relaxed manner" , "Living-room" , "Take it easy" , "Relax in sitting room?" , "Parlour" .)