A heavy hard-wearing waterproof fabric for outdoor use as a protective covering against moisture (9)

I believe the answer is:

tarpaulin

(Other definitions for tarpaulin that I've seen before include "Waterproof cloth" , "Heavy waterproof cover" , "Heavy waterproof canvas" , "oilskin hat" , "[SHHET]" .)

I've seen this clue in The Independent.

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