Skater's knee protector (3)

I believe the answer is:

pad

(Other definitions for pad that I've seen before include "Slang for flat - walk softly" , "Helicopter stand" , "Colloquial apartment or soft bundle" , "In slang, one's flat or bedsitter" , "Walk with soft steady steps" .)

I've seen this clue in the USA Today and the Universal.

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