Mark used satin (5)
I believe the answer is:
stain
'mark' is the definition.
('stain' can be a synonym of 'mark')
'used satin' is the wordplay.
'used' indicates an anagram.
'satin' anagrammed gives 'STAIN'.
(Other definitions for stain that I've seen before include "Discoloured mark" , "Blot" , "Satin (anag.)" , "Mark with colour, dirt" , "Colour, dye" .)