Crossword Genius

"Gnarly!” (3)

Ross

I believe the answer is:

rad

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

This is the entire clue.

(Other definitions for rad that I've seen before include "Unit of radiation" , "measure of dangerous activity" .)

I've seen this clue in The Wall Street Journal, the Universal, the King Feature Syndicate, The New York Times and the USA Today.
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