Fool with ring impressing lover no more -- that's it!

I believe the answer is:

sex appeal

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

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

'fool with ring impressing lover no more' is the wordplay.
I cannot really understand how this works, but
'ring' could be 'peal' ('peal' can be a synonym of 'ring') and 'peal' is found within the answer.
This explanation may well be incorrect...

'that's' is the link.

Can you help me to learn more?

(Another definition for sex appeal that I've seen is " It".)

I've seen this clue in The Telegraph.

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