Try to catch rook that hurt amusing brother (7)
I believe the answer is:
groucho
'amusing brother' is the definition.
(one of the Marx Brothers)
'try to catch rook that hurt' is the wordplay.
'try' becomes 'go' (both can mean an attempt).
'to catch' is an insertion indicator.
'rook' becomes 'R' (chess abbreviation).
'that hurt' becomes 'ouch' (I've seen this before).
'r'+'ouch'='rouch'
'go' going around 'rouch' is 'GROUCHO'.
(Other definitions for groucho that I've seen before include "One of Harpo's brothers" , "One of Marx Brothers" , "One of four comedian brothers" , "Funny man" , "The Marx Brother with the moustache" .)