Holder of blade, one fighting? (5)
I believe the answer is:
rower
I believe this clue is a double definition.
'holder of blade' is the first definition.
(someone rowing with an oar - blade can mean an oar)
'one fighting?' is the second definition.
(someone having a row or a fight)
(Other definitions for rower that I've seen before include "He handles oars" , "Might one argue" , "Sportsperson" , "one pulling a blade?" , "Stroke with blade" .)