Crossword Genius

Train for space that lies beyond gravity (5)

Ross

I believe the answer is:

groom

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

'train' is the definition.
(I know that train can be written as groom)

'space that lies beyond gravity' is the wordplay.
I cannot really understand how this works, but
'space' could be 'room' (enough space or room to do something) and 'room' is located in the answer.
'gravity' could be 'g' and 'g' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?

(Other definitions for groom that I've seen before include "fellow for the match" , "Smarten" , "Recently-married man" , "Man in stable (about to be married?)" , "Officer of Royal Household" .)

I've seen this clue in the Sydney Morning Herald.
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