Crossword Genius

As mounted on hinges? (6)

Ross

I believe the answer is:

stamps

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'as mounted on hinges?' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I can't see?

This is the entire clue.

Can you help me to learn more?

(Other definitions for stamps that I've seen before include "Gummed receipts of postal fees" , "Brings one's foot down heavily on the envelope" , "Tokens stuck on letters" , "Postal tokens" , "Items of interest to a philatelist" .)

I've seen this clue in the Evening Standard.
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