Chimpanzee throttling little devil (3)

I believe the answer is:

imp

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

'little devil' is the definition.
(I've seen this before)

'chimpanzee throttling' is the wordplay.
'IMP' is hidden within the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for imp that I've seen before include "old graft" , "puck" , "A small mischievous devil" , "Small mischievous sprite" , "Little troublemaker" .)

I've seen this clue in The Guardian.

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