Crossword Genius

Is furious right away - for a long time (4)

Ross

I believe the answer is:

ages

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'long time' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ages that I've seen before include "Times" , "Donkey's years" , "(What seems) a very long time" , "Historical eras" , "Gets older" .)

I've seen this clue in the Evening Standard.
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