Crossword Genius

I upset Sunak, being cheeky sort (3)

Ross

I believe the answer is:

imp

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

'cheeky sort' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'i upset sunak being' is the wordplay.
I cannot really understand how this works, but
'i' is found in the answer.
'being' could be 'mp' (MP is an example) and 'mp' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for imp that I've seen before include "A little devil of mischief" , "Pixie" , "Mischievous child" , "Small demon" , "Mischievous creature" .)

I've seen this clue in The Sun.
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