Empty, unoccupied (6)

I believe the answer is:

vacant

I believe this clue is a double definition.

'empty' is the first definition.
(similar in meaning)

'unoccupied' is the second definition.
(synonyms)

(Other definitions for vacant that I've seen before include "Not filled, job or house" , "Horse in a race" , "Empty, not occupied" , "... Blank" , "Empty, unoccupied" .)

I've seen this clue in The Irish Times.

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