In Bhagalpur, an incomparable queen (4)
I believe the answer is:
rani
'queen' is the definition.
(thesaurus)
'in bhagalpur an incomparable' is the wordplay.
'in' indicates a hidden word.
'RANI' is hidden in the letters of 'bhagalpur an incomparable'.
(Other definitions for rani that I've seen before include "Indian princess" , "Wife of a rajah" , "Member of royal family" , "Rajah's wife from Iran" , "Wife of a raja" .)