Can it help keep the kettle warm? (3)
I believe the answer is:
fur
This clue might be a double definition.
'can' is the first 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?
'it help keep the kettle warm?' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for fur that I've seen before include "Hair covering animal's body" , "Coating formed on tongue of sick person" , "Hairy animal coat" , "Mink or ermine, say" , "eg Cat's coat" .)