Crossword Genius

Room for rocketry (5)

Ross

I believe the answer is:

space

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'room' is the first definition.
(I've seen this in another clue)

'rocketry' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for space that I've seen before include ""The final frontier"" , "Gap; --- Oddity (Bowie)" , "Cosmos" , "Empty area, may be outer" , "Room; gap" .)

I've seen this clue in the Evening Standard.
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