Rough rug fiber (5)
I believe the answer is:
sisal
'rough rug fiber' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sisal that I've seen before include "Agave fibre found in bad sails" , "Plant yielding rope fibre" , "Agave rope-fibre" , "material for painter, say?" , "Natural fibre" .)