People generally entertained by deceptively simple memory test (9)

I believe the answer is:

pelmanism

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'test' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?

I don't understand how the rest of the clue works.

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(Another definition for pelmanism that I've seen is " card game".)

I've seen this clue in The Independent.

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