Crossword Genius

Sudden intensification (5-2)

Ross

I believe the answer is:

flare-up

(Other definitions for flare-up that I've seen before include "Burst into flames" , "Explosion of emotion" , "Sudden outbreak (of violence, etc)" , "Sudden outbreak of anger" , "Suddenly get angry" .)

I've seen this clue in the King Feature Syndicate and The Sun.
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