Fight, scuffle (6)
I believe the answer is:
tussle
I believe this clue is a double definition.
'fight' is the first definition.
(I know that tussle is a type of fight)
'scuffle' is the second definition.
(I know that scuffle can be written as tussle)
(Other definitions for tussle that I've seen before include "'Physical fight, struggle (6)'" , "Rough and tumble" , "A struggle or conflict" , "Grapple" , "Go at it" .)