Crossword Genius

I again show anger (3)

Ross

I believe the answer is:

ire

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But I can't explain it at all! Could you help me understand?

(Other definitions for ire that I've seen before include "Fury" , "Anger among admirers" , "Choler" , "Losing head" , "Anger, annoyance" .)

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