Gets jumpy when one searches for weapons? (6)

I believe the answer is:

frisks

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'searches for weapons?' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for frisks that I've seen before include "Searches, for concealed weapons or drugs, say" , "Runs about happily or searches for concealed weapons" , "Gambols and searches" , "Informally searches as for concealed weapons" , "Searches manually as at security check" .)

I've seen this clue in the Evening Standard.

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