Turnover in Istanbul coffeehouse with staff (4)
I believe the answer is:
club
'staff' is the definition.
(thesaurus)
'turnover in istanbul coffeehouse' is the wordplay.
'turnover' says the letters should be written backwards.
'in' says the answer is hidden in the clue.
'bulc' is hidden within 'istanbul coffeehouse'.
'bulc' reversed gives 'CLUB'.
'with' acts as a link.
(Other definitions for club that I've seen before include "nightspot" , "In which one could be expecting" , "Good meeting-place" , "Truncheon" , "Association; cudgel" .)