Crossword Genius

Winter slopes activity (6)

Ross

I believe the answer is:

tubing

(Other definitions for tubing that I've seen before include "Hose or piping" , "through which water may be circulating" , "Length of hose or pipe" , "Cylindrical length(s) of metal, plastic etc" , "Hollow cylindrical containers, collectively" .)

I've seen this clue in The New York Times.
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