Dizzier or more frivolous (7)

I believe the answer is:

giddier

This clue is a double definition.

'dizzier' is the first definition.
('giddy' can be a synonym of 'dizzy')

'more frivolous' is the second definition.
('giddy' can be similar in meaning to 'frivolous')

(Another definition for giddier that I've seen is " More dizzy".)

I've seen this clue in The Irish Times.

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