Crossword Genius

Baseless bit of satire is to go downhill (3)

Ross

I believe the answer is:

ski

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This clue might be a double definition.

'baseless bit of satire' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'go downhill' is the second definition.
(go down a hill on skis)

'is to' is the link.

Can you help me to learn more?

(Other definitions for ski that I've seen before include "Aid to movement on snow" , "Piece of sports equipment" , "Slide downhill, sportingly" , "Mountain runner" , "Journey" .)

I've seen this clue in The Times.
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