Quarrelsome boatman? (5)

I believe the answer is:

rower

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'boatman?' is the definition.
(I know that rower is a type of boatman)

I can't explain the rest of the clue.

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

I've seen this clue in the Evening Standard.

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