Discoloration of satin maybe (5)
I believe the answer is:
stain
'discoloration' is the definition.
(I know that discoloration can be written as stain)
'satin maybe' is the wordplay.
'maybe' is an anagram indicator.
'satin' is an anagram of 'STAIN'.
'of' is the link.
(Other definitions for stain that I've seen before include "Black mark for saint" , "Spot - shame" , "Discoloration" , "Penetrative dye; mark" , "Blemish; colour (wood)" .)