Quarrelsome oarsman (5)
I believe the answer is:
rower
'oarsman' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rower that I've seen before include "one pulling a blade?" , "Maybe one in eight" , "Sportsperson" , "Oarsman/woman" , "Oarsman/oarswoman" .)