Of eight in a boat? (3)

I believe the answer is:

row

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'boat?' is the definition.
(rowing is a kind of boating)

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

(Other definitions for row that I've seen before include "Quarrel; use oars" , "Barney - rank" , "Propel boat manually" , "Fight in a queue?" , "Line, tier" .)

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