Skin pressure from endless heels (4)

I believe the answer is:

peel

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'skin' is the definition.
(I know that skin can be written as peel)

I can't explain the rest of the clue.

(Other definitions for peel that I've seen before include "island" , "Remove skin as from potato" , "See 4 and 22" , "A PM; a fortified tower" , "Remove skin of vegetable or fruit" .)

I've seen this clue in The Mirror.

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