Source of money shortly provides pleasure (3)

I believe the answer is:

fun

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'pleasure' is the definition.
(fun is enjoyment or pleasure)

I can't explain the rest of the clue.

(Other definitions for fun that I've seen before include "'Merriment, playfulness (3)'" , "entertainment" , "Light-hearted amusement, jollity" , "Jollification" , "Playful amusement" .)

I've seen this clue in The Times.

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