Cloth shows unfortunate stain (5)
I believe the answer is:
satin
'cloth' is the definition.
(I know that satin is a type of cloth)
'unfortunate stain' is the wordplay.
'unfortunate' indicates an anagram.
'stain' is an anagram of 'SATIN'.
'shows' acts as a link.
(Other definitions for satin that I've seen before include "Lustrous fabric" , "Rich cloth" , "Silk fabric" , "Silky material" , "Fine material" .)