Crossword Genius

Be on one's guard (6)

Ross

I believe the answer is:

beware

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be on one's guard</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for beware that I've seen before include "Archaic word for look out, mind yourself" , "cave" , "Archaic injunction to be careful, look out" , "Take heed" , "Wee bra (anag)" .)

I've seen this clue in the Evening Standard.
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