Once again insist on some sunscreen for cellulite (2-7)

I believe the answer is:

re-enforce

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'once again insist' is the definition.
I can't tell whether this definition defines the answer.

'some sunscreen for cellulite' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'RE-ENFORCE' is hidden within 'sunscreen for cellulite'.

'on' acts as a link.

Can you help me to learn more?

(Another definition for re-enforce that I've seen is " Impose again".)

I've seen this clue in The Independent.

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