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Muscle that might make chins pert? Yes and no (9)

Ross

I believe the answer is:

sphincter

I'm a little stuck... Click here to teach me more about this clue!

'muscle' is the definition.
(I know that sphincter is a type of muscle)

'might make chins pert? yes and no' is the wordplay.
'chins pert' can be anagrammed to 'SPHINCTER'.
However, I am not sure how this is indicated.

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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