Crossword Genius

Macintosh make from water­proofed cotton fabric (7)

Ross

I believe the answer is:

oilskin

(Other definitions for oilskin that I've seen before include "Protective coat" , "Waterproof fabric" , "Waterproof cloth for rain-gear" , "Heavy-duty waterproof" , "protection for Ainslie?" .)

I've seen this clue in The Guardian.
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