Glasspaper (with gap in middle) (6)

I believe the answer is:

mirror

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'gap in middle' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for mirror that I've seen before include "It reflects images" , "parrot?" , "Daily paper" , "Reflect" , "Reflective glass" .)

I've seen this clue in The Daily Mail.

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