Internet joke about new moon (5)

I believe the answer is:

mneme

'moon' is the definition.
(Mneme is a moon of Jupiter)

'internet joke about new' is the wordplay.
'internet joke' becomes 'meme' (memes are jokes spread online).
'about' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'meme' going around 'n' is 'MNEME'.

I've seen this clue in The Times.

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