Crossword Genius

Watering hole that's out of this world where those close to the stars drink presumably? The Long Key!

Ross

I believe the answer is:

space bar

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This could be a double definition.

'watering hole that's out of this world where those close to the stars drink presumably?' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'the long key' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for space bar that I've seen before include "Longest typing key" , "Long key on a typewriter" , "It is found on a keyboard" , "The biggest typewriter key" , "It's on the bottom row of a keyboard" .)

I've seen this clue in the Irish Times.
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