Clearly entails a protein like collagen (7)

I believe the answer is:

elastin

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

'collagen' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe there's a link between them I don't understand?

'clearly entails a protein' is the wordplay.
'entails' can be anagrammed to 'ELASTIN'.
But, I am not sure how this is indicated.

'like' is the link.

Can you help me to learn more?

(Another definition for elastin that I've seen is " protein".)

I've seen this clue in the Sydney Morning Herald.

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