Crossword Genius

Yet she may be a man on board (5)

Ross

I believe the answer is:

queen

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'man on board' is the definition.
(chess)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for queen that I've seen before include "Promote pawn" , "ER, say?" , "powerful man on board" , "Ruling lady" , "Female sovereign ruler" .)

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