Key amenity Virgin Galactic might offer (5,3)

I believe the answer is:

space bar

'key' is the definition.
(space bar is a kind of key)

I can't explain the rest of the clue.

(Other definitions for space bar that I've seen before include "used by typists?" , "A keyboard feature" , "Restaurant at the End of the Universe?" , "Key feature" , "The biggest typewriter key" .)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app