Crossword Genius

For Jonah, it’s said, high ones are fun (5)

Ross

I believe the answer is:

jinks

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

'fun' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for jinks that I've seen is " Dodges".)

I've seen this clue in the Evening Standard.
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