Swear in turn emptying pub (6)
I believe the answer is:
tavern
'pub' is the definition.
(thesaurus)
'swear in turn emptying' is the wordplay.
'swear' becomes 'aver' ('aver' can be a synonym of 'swear').
'in' means one lot of letters goes inside another.
'emptying' says to hollow out the word (remove centre letters).
'turn' with its centre removed is 'tn'.
'aver' placed inside 'tn' is 'TAVERN'.
(Other definitions for tavern that I've seen before include "drinking establishment" , "Old-fashioned word for pub" , "An old English pub" , "Alehouse" , "An old inn or hostelry" .)