Crossword Genius

Roomy sort of ship? (5)

Ross

I believe the answer is:

space

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This might be a double definition.

'roomy sort' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'ship?' is the second definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

'of' acts as a link.

Can you help me to learn more?

(Other definitions for space that I've seen before include "-- Capsule; -- bar" , "Interstellar vacuum" , "Room; gap" , "Blank" , "Cosmos" .)

I've seen this clue in the Evening Standard.
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