Durable twilled fabric (5)
I believe the answer is:
serge
'durable twilled fabric' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for serge that I've seen before include "Twilled fabric; name" , "Stuff" , "Strong twilled worsted fabric" , "Durable fabric" , "A twill fabric" .)