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Extracts energy, legal up to a point (7)

Ross

I believe the answer is:

elicits

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'extracts' is the definition.
('elicit' can be a synonym of 'extract')

'energy legal up to a point' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'legal' becomes 'licit' (similar in meaning).
'up to a point' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'e'+'licit'+'s'='ELICITS'

Can you help me to learn more?

(Another definition for elicits that I've seen is " Draws out, response or information".)

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