Crossword Genius

Power game played by Oz actress (9)

Ross

I believe the answer is:

megawatts

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'oz actress' is the definition.
Although both the answer and 'actress' are nouns, they are not in the same form of the noun.

'power game played by' is the wordplay.
'power' becomes 'watts' (I can't explain this - if you can you should give a lot more credence to this answer).
'played' indicates an anagram (letters playing around).
'by' is a charade indicator (letters next to each other).
'game' with letters rearranged gives 'mega'.
'watts' put after 'mega' is 'MEGAWATTS'.

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