Agave plant (5)
'agave plant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sisal that I've seen before include "Agave fibre found in bad sails" , "Plant fibre used for ropes" , "Fibrous plant used for rope" , "Agave rope-fibre" , "Strong rope fibre" .)
'agave plant' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yucca that I've seen before include "Common indoor plant" , "Ornamental plant" , "Mexican plant" , "Tropical American liliaceous plant" , "tapioca!" .)