Frivolity (6)

I believe the answer is:

levity

'frivolity' is the definition.
(I know that levity is a type of frivolity)

This is all the clue.

(Other definitions for levity that I've seen before include "Light-heartedness" , "Unseriousness" , "Facetiousness" , "Disrespectful treatment of a serious matter" , "Lack of seriousness" .)

I've seen this clue in The Telegraph.

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