The man's in court for a case (5)
I believe the answer is:
chest
'a case' is the definition.
(thesaurus)
'the man's in court' is the wordplay.
'the man' becomes 'hes' (I've seen this in other clues**).
'in' is an insertion indicator.
'court' becomes 'ct'.
'hes' put within 'ct' is 'CHEST'.
'for' acts as a link.
(Other definitions for chest that I've seen before include "Breast - case" , "It's enclosed by the ribs" , "Box or trunk" , "Treasure box?" , "Trunk or crate" .)