Scuffle, rough-and-tumble (6)
I believe the answer is:
tussle
This clue is a double definition.
'scuffle' is the first definition.
(I know that scuffle can be written as tussle)
'rough-and-tumble' is the second definition.
(I know that rough-and-tumble can be written as tussle)
(Other definitions for tussle that I've seen before include "Sharp struggle" , "Struggle like wrestling bout" , "Vigorous struggle or scuffle" , "Fight vigorously" , "Go at it" .)