Canvas cover
I think it could be either:
'canvas cover' 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 "Bail-out" , "canvas sheet" , "Cover" .)
'canvas cover' is the definition.
(canvas shelter)
This is the entire clue.
(Other definitions for tent that I've seen before include "Bivvy" , "Guy" , "Collapsible shelter" , "Marquee" , "Temporary accommodation" .)