Suffer - b----- man! (5)
I believe the answer is:
brook
'suffer' is the definition.
('brook' can be a synonym of 'suffer')
'b-man' is the wordplay.
'man' becomes 'rook' (rook is a kind of man**).
'b'+'rook'='BROOK'
(Other definitions for brook that I've seen before include "Stream; put up with" , "running water" , "Small fresh-water stream" , "Bear - small stream" , "Allow" .)