Crossword Genius

Piece of gummed paper (5)

Ross

I believe the answer is:

stamp

I'm a little stuck... Click here to teach me more about this clue!

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" .)

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