Smooth glossy fabric (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
satin
'smooth glossy fabric' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for satin that I've seen before include "Silky material" , "Rich cloth" , "Smooth and silky" , "Fine material" , "Glossy textile" .)