Crossword Genius

Pave with stones and waterproofing material (5)

Ross

I believe the answer is:

pitch

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'waterproofing material' is the definition.

I don't understand the rest of the clue.

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(Other definitions for pitch that I've seen before include "cast?" , "-- and putt" , "Throw or fall headlong" , "Level of sound" , "Tar; lob" .)

I've seen this clue in The Telegraph.
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