Doctor in Brighton (3)
I believe the answer is:
rig
'doctor' is the definition.
(thesaurus)
'in brighton' is the wordplay.
'in' indicates a hidden word.
'RIG' is hidden in the letters of 'brighton'.
(Other definitions for rig that I've seen before include "Oil-drilling device" , "Arrange the outcome of by means of deceit" , "uniform perhaps" , "Fix; equip" , "set-up" .)