Flimsy material (8)
I believe the answer is:
gossamer
'flimsy material' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for gossamer that I've seen before include "Very thin material" , "Very fine gauze" , "Filaments of a cobweb" , "Fine product of spiders" , "Fabric like spider's web" .)