Crossword Genius

They may flare (7)

Ross

I believe the answer is:

tempers

'they may flare' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tempers that I've seen before include "Hardens metal by heating and cooling" , "Hardens steel" .)

I've seen this clue in the Universal and The Wall Street Journal.
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