Crossword Genius

The final frontier (5)

Ross

I believe the answer is:

space

'the final frontier' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for space that I've seen before include "Empty area, may be outer" , "Unfilled region" , "Interstellar region" , ""The final frontier"" , "Interstellar vacuum" .)

I've seen this clue in the Universal.
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