Light-heartedness (6)

I believe the answer is:

levity

'light-heartedness' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for levity that I've seen before include "Light-heartedness" , "Manner lacking seriousness" , "Light quality" , "Hair-piece" , "Frivolity, lightweight laughter" .)

I've seen this clue in The Times, The Sunday Times and The Guardian.

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