Twin reported for fight (4)
I believe the answer is:
duel
'for fight' is the definition.
(dueling is a kind of fighting)
'twin reported' is the wordplay.
'twin' becomes 'dual' (I've seen this in another clue).
'reported' indicates a 'sounds like' (homophone) clue.
'dual' is a homophone of 'DUEL'.
(Other definitions for duel that I've seen before include "Potentially fatal fight between two people" , "Affaire d'honneur" , "One got satisfaction from this" , "Contest to settle point of honour" , "Single combat" .)