Crossword Genius

Be wary of a hunter, say (5)

Ross

I believe the answer is:

watch

I'm a little stuck... Click here to teach me more about this clue!

'hunter say' is the definition.
(hunter is a kind of watch)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for watch that I've seen before include "See 21" , "Keep an eye on - timepiece" , "Timepiece - look out" , "period of duty" , "Keep under observation" .)

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