Piece of gummed paper (5)
I believe the answer is:
stamp
This might be a double definition.
'piece of' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'gummed paper' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for stamp that I've seen before include "Postal label" , "Mark of approval" , "Imprint, brand" , "Impress; postage sticker" , "Cut out with a die" .)