Manage to probe corrupt deal somewhere in West Sussex (7)
I believe the answer is:
arundel
'somewhere in west sussex' is the definition.
(Arundel is a town in West Sussex)
'manage to probe corrupt deal' is the wordplay.
'manage' becomes 'run' (both can mean to organise).
'to probe' means one lot of letters goes inside another (probe can mean to poke or prod into).
'corrupt' indicates an anagram.
'deal' is an anagram of 'adel'.
'run' put inside 'adel' is 'ARUNDEL'.
(Other definitions for arundel that I've seen before include "West Sussex town with a castle" , "Castle in W. Sussex" , "English public school" , "somewhere in W Sussex" , "Norfolk seat" .)