I hit boxer brawling in shower (9)
I believe the answer is:
exhibitor
'shower' is the definition.
(I've seen this before)
'i hit boxer brawling' is the wordplay.
'brawling' is an anagram indicator.
'i'+'hit'+'boxer'='ihitboxer'
'ihitboxer' is an anagram of 'EXHIBITOR'.
'in' acts as a link.
(Other definitions for exhibitor that I've seen before include "shower" , "One showing items in gallery display" , "One displaying (at show)" , "Person displaying" , "showman" .)