Runner a Pole may be finished with (3)

I believe the answer is:

ski

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'runner' is the definition.
(something which 'runs', ie moves quickly on snow)

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

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(Other definitions for ski that I've seen before include "Hit the slopes" , "What one might do in Alps" , "Participate in winter sport" , "Glide or race across snow with feet attachments" , "Runner for use on snow" .)

I've seen this clue in the Evening Standard.

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