Underwear made from fibres (6)
I believe the answer is:
briefs
'underwear' is the definition.
(I've seen this before)
'from fibres' is the wordplay.
'from' is an anagram indicator (from the letters).
'fibres' is an anagram of 'BRIEFS'.
'made' is the link.
(Other definitions for briefs that I've seen before include "CLOTHING" , "Summaries of legal cases" , "Barristers' cases or advices" , "They are prepared for barristers' perusal" , "Underpants, knickers" .)