In Bhopal, a thick, long, heavy stick (5)
I believe the answer is:
lathi
'heavy stick' is the definition.
(I've seen this before)
'in bhopal a thick long' is the wordplay.
'in' indicates a hidden word.
'LATHI' can be found hidden inside 'bhopal a thick long'.
(Other definitions for lathi that I've seen before include "Indian policeman's stick" , "club used by an Indian policeman" , "club in India" , "instrument of punishment" , "may give wallop to dacoit" .)