Stuff that makes a bad stain (5)
I believe the answer is:
satin
'stuff that' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'a bad stain' is the wordplay.
'a bad' indicates an anagram.
'stain' with letters rearranged gives 'SATIN'.
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for satin that I've seen before include "Smooth glossy fabric" , "Stain on silky cloth" , "covered with?" , "Stain on shiny cloth" , "Glossy textile" .)