Crossword Genius

Unfilled space (4)

Ross

I believe the answer is:

void

'unfilled space' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for void that I've seen before include "Free" , "Null and empty" , "Not valid, empty space" , "Null or emptiness" , "Empty or vacant, like space" .)

I've seen this clue in the Universal.
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