Crossword Genius

Furious criminal losing power initially (5)

Ross

I believe the answer is:

irate

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'furious' is the definition.
(I know that furious can be written as irate)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for irate that I've seen before include "Annoyed, nettled" , "Boiling" , "Extremely angry" , "Indignant, angry" , "Wrathful" .)

I've seen this clue in The Times.
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