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Extremes of exploitation editor gleefully used to demonstrate power (6)

Ross

I believe the answer is:

energy

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'power' is the definition.
(synonyms)

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(Other definitions for energy that I've seen before include "Vigour, spirit" , "Vivacity" , "It's measured in joules or ergs" , "Vigour, animation" , "'Vigour, vitality (6)'" .)

I've seen this clue in The Irish Times.
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