Self-obsessed, humorous image (4)

I believe the answer is:

meme

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'image' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for meme that I've seen before include "Transmitted cultural idea" , "Cultural belief that assumes a life of its own" , "Behavioural trait" , "online phenomenon" , "Question that spreads on the internet" .)

I've seen this clue in The Daily Express.

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