Crossword Genius

Caper apt to check one's growth? (5)

Ross

I believe the answer is:

stunt

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

'caper' is the definition.
(thesaurus)

'apt to check one's growth?' is the wordplay.
I cannot quite see how this works, but
'one' could be 'un' (I've seen this in other clues) and 'un' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for stunt that I've seen before include "Spectacularly daring action; retard growth" , "Difficult (usually dangerous) feat" , "Publicity seeking escapade" , "Exhibitionistic performance" , "Daring act - cause not to develop" .)

I've seen this clue in the Evening Standard.
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