Exploit of most untimeliness (5)

I believe the answer is:

stunt

'exploit' is the definition.
(I know that stunt is a type of exploit)

'of most untimeliness' is the wordplay.
'of' says the answer is hidden in the clue.
'STUNT' is hidden within 'most untimeliness'.

(Other definitions for stunt that I've seen before include "Spectacular exploit" , "Check the growth of (something)" , "Restrict growth" , "Daring act - cause not to develop" , "Impede growth" .)

I've seen this clue in The Daily Express.

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