Such suits are appropriately roomy (5)

I believe the answer is:

space

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'such suits are' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for space that I've seen before include "Blank" , "Cosmos" , "Room for capes" , "sci-fi theme" , "Emptiness" .)

I've seen this clue in the Evening Standard.

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