Crossword Genius

One politician is a scoundrel (3)

Ross

I believe the answer is:

imp

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

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

'is' acts as a link.

Can you help me to learn more?

(Other definitions for imp that I've seen before include "A small mischievous devil" , "little chap" , "Little mischief-maker" , "A mischievous little devil" , "puck" .)

I've seen this clue in The Mirror.
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