A shine's not right for this material (7)
I believe the answer is:
hessian
'this material' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'a shine's not right' is the wordplay.
'not right' indicates an anagram.
'a'+'shines'='ashines'
'ashines' anagrammed gives 'HESSIAN'.
'for' is the link.
Can you help me to learn more?
(Other definitions for hessian that I've seen before include "Cloth made from jute" , "Coarse cloth" , "sackcloth?" , "Coarse fabric used in sacks" , "It's rather like sacking" .)