Stop rubbing metal sheet with top scratched (3)
I believe the answer is:
oil
'stop rubbing' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for oil that I've seen before include "Crude" , "Greasy liquid" , "Viscous substance as lubricant" , "Valuable viscous liquid" , "Lubricating liquid" .)
