Crossword Genius

Flaring up again having lost it in power (8)

Ross

I believe the answer is:

reigning

I'm a little stuck... Click here to teach me more about this clue!

'in power' is the definition.
(I've seen this in another clue)

'flaring up again having lost it' is the wordplay.
I cannot quite see how this works, but
'again' could be 're' (prefix meaning 'again') and 're' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for reigning that I've seen is " Ruling over like a sovereign".)

I've seen this clue in The Independent.
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