'Make do with less': politician ousted to go downhill fast (3)

I believe the answer is:

ski

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'go downhill fast' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for ski that I've seen before include "Move over snow or water" , "Winter sport equipment" , "Go downhill rapidly" , "Aid to movement on snow" , "Piece of sports equipment" .)

I've seen this clue in The Guardian.

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