Crossword Genius

Outcry as it's frightening (5)

Ross

I believe the answer is:

scary

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

I don't understand the rest of the clue.

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(Other definitions for scary that I've seen before include "Alarming, maybe paranormal" , "[SPICE]" , "Frightening or spooky" , "Fearsome" , "spook" .)

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