Man free to catch fish (7)
I believe the answer is:
richard
'man' is the definition.
(I've seen this before)
'free to catch fish' is the wordplay.
'free' becomes 'rid' (to be free of something is to be rid of it).
'to catch' means one lot of letters goes inside another.
'fish' becomes 'char' (char is a kind of fish).
'rid' placed around 'char' is 'RICHARD'.
(Other definitions for richard that I've seen before include "-- Wagner, composer" , "'Beau' Nash's first name" , "Sir Cliff" , "Play about hunchback" , "Boy's name - Cliff?" .)