Bit of a scrimmage (5)
I believe the answer is:
scrap
I believe this clue is a double definition.
'bit' is the first definition.
('scrap' can be a synonym of 'bit')
'a scrimmage' is the second definition.
(thesaurus)
'of' acts as a link.
(Other definitions for scrap that I've seen before include "Fragment or remnant" , "Junk; altercation" , "Waste metal or informal fight" , "Cancel; fight" , "Abolish; leftover" .)