Crossword Genius

Mac to use moisturiser (7)

Ross

I believe the answer is:

oilskin

'mac' is the definition.
(oilskin is a type of raincoat or macintosh)

I can't explain the remainder of the clue.

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

I've seen this clue in The Guardian.
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