Quarrelsome looking regatta competitor? (5)

I believe the answer is:

rower

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'regatta competitor?' is the definition.
(I've seen this in another clue)

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

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(Other definitions for rower that I've seen before include "Oarsman (or woman)" , "Perhaps stroke" , "One who argues" , "Oarsman/oarswoman" , "One in eight, perhaps" .)

I've seen this clue in the Evening Standard.

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