Crossword Genius

Guard your marbles? (4)

Ross

I believe the answer is:

mind

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'marbles?' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for mind that I've seen before include "Consciousness" , "Intelligence" , "Intellect; object to" , "'Out of sight, out of ....'" , "Look after" .)

I've seen this clue in The Irish Times.
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