Crossword Genius

Another name for polo? (5)

Ross

I believe the answer is:

marco

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

I cannot understand how the rest of the clue works.

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(Other definitions for marco that I've seen before include "gondolier" , "- - Polo, traveller" .)

I've seen this clue in the Evening Standard.
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