Sportsperson's captain never showing pressure (5)

I believe the answer is:

skier

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'pressure' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for skier that I've seen before include "Sport exponent" , "Mountain racer" , "needs catching on way down" , "Slider on snow" , "Winter sports athlete" .)

I've seen this clue in The Guardian.

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