Crossword Genius

Quarrelsome oarsman (5)

Ross

I believe the answer is:

rower

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'oarsman' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(Other definitions for rower that I've seen before include "one pulling a blade?" , "Maybe one in eight" , "Sportsperson" , "Oarsman/woman" , "Oarsman/oarswoman" .)

I've seen this clue in The Globe and Mail.
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