Muscles essential to correct imbalance (5)

I believe the answer is:

recti

'muscles' is the definition.
(I've seen this before)

'essential to correct imbalance' is the wordplay.
'essential to' indicates a hidden word (I've seen this in other clues).
'RECTI' can be found hidden inside 'correct imbalance'.

(Another definition for recti that I've seen is " Straight muscles; trice (anag.)".)

I've seen this clue in The Times.

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