Measure of energy in back muscle or other muscle (7)

I believe the answer is:

levator

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'other muscle' is the definition.
'levator' can be an answer for 'muscle' (I've seen this before). I am not certain of the 'other' bit.

'measure of energy in back muscle or' is the wordplay.
'measure of energy' becomes 'ev' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' is an insertion indicator.
'back muscle' becomes 'la t' (I've seen this in another clue).
'ev' placed within 'lat' is 'levat'.
'levat'+'or'='LEVATOR'

Can you help me to learn more?

(Another definition for levator that I've seen is " muscle".)

I've seen this clue in The Independent.

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