Crossword Genius

Activate false alarm (3,4)

Ross

I believe the answer is:

cry wolf

(Other definitions for cry wolf that I've seen before include "Raise false alarm of vulpine sort" , "Cause a false alarm" , "Create fake alarm" , "Raise a false alarm too often, then not being believed when help is really needed" , "Give unnecessary cause for alarm" .)

I've seen this clue in The Guardian.
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