Sportsman's captain rendered quite powerless (5)

I believe the answer is:

skier

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'sportsman's' is the definition.
(someone who skis)

I don't understand the rest of the clue.

(Other definitions for skier that I've seen before include "Winter sportsperson" , "Slider on snow" , "Winter sports athlete" , "He glides across snow for fun" , "Winter sportsman" .)

I've seen this clue in The Times.

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