Material that did not stand out? (5)
I believe the answer is:
'material' is the definition.
(satin is a kind of material)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for satin that I've seen before include "Silky material" , "Glossy textile" , "Rich cloth" , "Lustrous fabric" , "Smooth and silky" .)