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Is furious. Could last for a long time (5)

Ross

I believe the answer is:

rages

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'is furious' is the definition.
I can't tell whether this defines the answer.

'last for a long time' is the wordplay.
'last' indicates one should take the final letters.
'a long time' becomes 'ages' (ages can mean a very long time).
The last letter of 'for' is 'r'.
'r'+'ages'='RAGES'

'could' is the link.

Can you help me to learn more?

(Other definitions for rages that I've seen before include "gives anger vent" , "Passions" , "speaks as Hitler!" , "becomes furious" , "States of extreme anger" .)

I've seen this clue in the Sydney Morning Herald.
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