Waterproof sheet (4)
'waterproof sheet' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tarpaulin that I've seen before include "oilskin hat" , "Heavy waterproof canvas" , "Waterproofed canvas" , "Waterproof cloth" , "protective headgear" .)
'waterproof sheet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tarp that I've seen before include "Cover" , "canvas sheet" , "Bail-out" .)