Crossword Genius

Scheme taken up by venal politician (4)

Ross

I believe the answer is:

plan

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

I don't understand how the remainder of the clue works.

(Other definitions for plan that I've seen before include "Layout drawing" , "Scheme - map" , "Intention or decision about what one is going to do" , "Schedule" , "Formulate" .)

I've seen this clue in The Guardian.
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