Crossword Genius

Devil an individual among many at Westminster? (3)

Ross

I believe the answer is:

imp

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

'devil' is the definition.
(devilish creature)

'an individual among many at westminster?' is the wordplay.
I cannot quite understand how this works, but
'an' could be 'i' (Roman numeral for one) and 'i' is found in the answer.
'individual' could be 'mp' (MP is an example) and 'mp' is present in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for imp that I've seen before include "Naughty child" , "pickle" , "Mischievous child" , "Scallywag" , "A mischievous little devil" .)

I've seen this clue in The Sun and The Times.
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