Perhaps a stylish jumper in the event of winter sport (5)

I believe the answer is:

skier

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'sport' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

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 "High ball; Alpine sportsman" , "Sportsman who glides over snow" , "He glides over snow, perhaps in sport" , "Winter sports person" , "Slider on snow" .)

I've seen this clue in the Evening Standard.

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