Brave woman loses in brawling (7)
I believe the answer is:
lioness
'brave woman' is the definition.
(I've seen this before)
'loses in brawling' is the wordplay.
'brawling' is an anagram indicator.
'loses'+'in'='losesin'
'losesin' with letters rearranged gives 'LIONESS'.
(Other definitions for lioness that I've seen before include "Leo's mate" , "One with pride" , "Queen of beasts?" , "Female carnivore" , "Female pride member" .)