Exhausted masseuse drops trousers (4)
I believe the answer is:
used
'exhausted' is the definition.
(exhaust can mean to use up)
'masseuse drops trousers' is the wordplay.
'trousers' indicates a hidden word (trouser can mean to steal or take).
'USED' can be found hidden inside 'masseuse drops'.
(Other definitions for used that I've seen before include "Put to a purpose" , "given employment" , "Employed - exploited" , "no stranger" , "Accustomed - exploited" .)