Tent fabric (6)
I believe the answer is:
canvas
'tent fabric' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for canvas that I've seen before include "Strong coarse cloth" , "Woven fabric for sails and tents" , "Coarse cloth for sails, tents etc" , "Painting base" , "Fabric for sail, tent and painting" .)