Crossword Genius

Possible creator of power (7)

Ross

I believe the answer is:

reactor

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

'power' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'possible creator' is the wordplay.
'creator' anagrams to 'REACTOR'.
However, I'm not sure how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for reactor that I've seen before include "one liable to have a meltdown if things go disastrously?" , "Producer of nuclear energy" , "Heart of a nuclear power station" , "Nuclear power plant" , "source of power, perhaps" .)

I've seen this clue in the Evening Standard.
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