Wearer of extra-long slippers (5)

I believe the answer is:

skier

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'wearer' is the definition.
The definition and answer 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.

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

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