Let Maria weave fabric (8)
I believe the answer is:
material
'fabric' is the definition.
(I know that fabric can be written as material)
'let maria weave' is the wordplay.
'weave' indicates anagramming the letters.
'let'+'maria'='letmaria'
'letmaria' anagrammed gives 'MATERIAL'.
(Other definitions for material that I've seen before include "Fabric, stuff" , "Essential" , "Fabric or other substance" , "Matter; fabric" , "Substantial -- textile" .)