Writings by biblical priest rejected material stuff ... (7)
I believe the answer is:
textile
'material stuff' is the definition.
'writings by biblical priest rejected' is the wordplay.
'writings' becomes 'text'.
'by' is a charade indicator (letters next to each other).
'biblical priest' becomes 'eli' (I've seen this before).
'rejected' says the letters should be written in reverse.
'eli' backwards is 'ile'.
'text'+'ile'='TEXTILE'
(Other definitions for textile that I've seen before include "Cloth, fabric, material" , "The cloth's" , "Woven or machine-knitted fabric" , "Woven cloth" , "Cloth made by weaving or knitting" .)