Exercises invigorated G, for one (5,6)

I believe the answer is:

video rating

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'g for one' is the definition.
I can't tell whether this definition defines the answer.

'exercises invigorated' is the wordplay.
'exercises' indicates anagramming the letters (letters exercise or move around).
'invigorated' anagrammed gives 'VIDEO RATING'.

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

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