Delicate material found when sorting some rags (8)
I believe the answer is:
gossamer
'delicate material' is the definition.
(I've seen this before)
'sorting some rags' is the wordplay.
'sorting' is an anagram indicator.
'some'+'rags'='somerags'
'somerags' is an anagram of 'GOSSAMER'.
'found when' acts as a link.
(Other definitions for gossamer that I've seen before include "Material spun by spiders" , "Filmy threads seen on hedges" , "Delicate filmy material" , "Fine product of spiders" , "Very thin material" .)