It's a pleasure! (3)

I think it could be either:

Which length description are you looking for?:

fun

'it's a pleasure' is the definition.
(fun is enjoyment or pleasure)

This is all the clue.

(Other definitions for fun that I've seen before include "Light-hearted amusement, jollity" , "Playful amusement" , "Light-hearted pleasure" , "Jollification" , "Entertaining" .)

I've seen this clue in the Evening Standard.

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