Bed not wasting material (6)
I believe the answer is:
cotton
'material' is the definition.
(I know that cotton is a type of woven fabric)
'bed not wasting' is the wordplay.
'bed' becomes 'cot' (cot is a kind of bed).
'wasting' indicates anagramming the letters (waste can mean to destroy).
'not' is an anagram of 'ton'.
'cot'+'ton'='COTTON'
(Other definitions for cotton that I've seen before include "Old golfer" , "Golfing man" , "Substance like fine wool" , "Cloth made from fine hairs of seed pod" , "Fabric woven from plant fibres" .)