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Catch sight of a man who endangers Western security? (4)

Ross

I believe the answer is:

espy

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

This clue could be a double definition.

'catch' is the first definition.
(I've seen this in another clue)

'sight of a man who endangers western security?' is the second definition.
'espy' can be an answer for 'sight' (I've seen this in another clue). I am not certain of the remainder of the definition.

Can you help me to learn more?

(Other definitions for espy that I've seen before include "See" , "Perceive" , "Observe (arch.)" , "Pick out at a distance" , "Spot; observe" .)

I've seen this clue in The Globe and Mail.
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