Crossword Genius

One politician is a rogue (3)

Ross

I believe the answer is:

imp

'rogue' is the definition.
(thesaurus)

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

'is a' acts as a link.

(Other definitions for imp that I've seen before include "A little devil of mischief" , "Mischievous fairy No.1" , "Goblin" , "Pixie" , "Evil spirit" .)

I've seen this clue in The Mirror.
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