Crossword Genius

A little world in space (3)


I believe the answer is:


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This might be a double definition.

'a little world' is the first definition.
The definition suggests a singular noun which matches the answer.

'space' is the second definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'in' is the link.

Can you help me to learn more?

(Another definition for mir that I've seen is " Russian space station".)

I've seen this clue in the Evening Standard.
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