Servant blowing top working in bar (6)
I believe the answer is:
tavern
'bar' is the definition.
(thesaurus)
'servant blowing top working' is the wordplay.
'blowing top' means to remove the first letter.
'working' is an anagram indicator.
'servant' with its first letter taken away is 'ervant'.
'ervant' with letters rearranged gives 'TAVERN'.
'in' is the link.
(Other definitions for tavern that I've seen before include "Old song: 'There is a ...... in the town, in the town'" , "Building with a bar" , "An old inn or hostelry" , "Tap-house" , "drinking establishment" .)