Basket weaver's material (5)
I believe the answer is:
osier
'basket weaver's material' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for osier that I've seen before include "Willow for making baskets" , "Willow growing shoots used in basketwork" , "Kind of twig used in basketwork" , "branch" , "Willow for basket making" .)