Crossword Genius

"Watch your head!" (4)

Ross

I think it could be either:

mind

duck

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'head' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for duck that I've seen before include "See 16" , "Dear; bird; fabric" , "Evade, nought (cricket)" , "Steer clear" , "Mallard, say, or eider" .)

I've seen this clue in the L.A. Times Daily, the Newsday and the Evening Standard.
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