End of material, excellent fabric (4)
I believe the answer is:
lace
'fabric' is the definition.
(lace is a kind of fabric)
'end of material excellent' is the wordplay.
'end of' suggests the final letters.
'excellent' becomes 'ace' (I've seen this before).
The last letter of 'material' is 'l'.
'l'+'ace'='LACE'
(Other definitions for lace that I've seen before include "Famous play ''Arsenic and Old . . . .''" , "Do up (shoe, etc)" , "Shoe tie" , "Fabric made in openwork design" , "Fortify with spirits; open fabric" .)