Crossword Genius

Abandon cycling park in Denmark when surrounded by youngsters (9)

Ross

I believe the answer is:

frivolity

I'm a little stuck... Click here to teach me more about this clue!

'abandon' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Independent.
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