One politician is scoundrel (3)

I believe the answer is:

imp

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'scoundrel' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'one politician' is the wordplay.
'one' becomes 'i' (Roman numeral).
'politician' becomes 'MP' (Member of Parliament).
'i'+'mp'='IMP'

'is' is the link.

Can you help me to learn more?

(Other definitions for imp that I've seen before include "little chap" , "Small mischievous sprite" , "Wicked spirit" , "Scamp" , "Young troublemaker" .)

I've seen this clue in The Mirror.

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