Crossword Genius

Keep man on board (6)

Ross

I believe the answer is:

castle

This clue is a double definition.

'keep' is the first definition.
(I've seen this before)

'man on board' is the second definition.
(man can mean a chess piece)

(Other definitions for castle that I've seen before include "a piece in the corner" , "Move king to safety - stronghold" , "Stronghold - chessman" , "Man on board" , "Large fortified building" .)

I've seen this clue in The Times.
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