Greens receiving stretch will make motley art (7)
I believe the answer is:
collage
'art' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for collage that I've seen before include "Paste-up" , "Artwork formed from scraps of paper, photos etc" , "work being stuck" , "Assembled-fragments art" , "Art form using glued pieces" .)