Crossword Genius

On the house that's vacant (4)

Ross

I believe the answer is:

free

I believe this is a double definition.

'on the house' is the first definition.
(something on the house is given away free)

'vacant' is the second definition.
(thesaurus)

'that's' acts as a link.

(Other definitions for free that I've seen before include "Liberated" , "Not under restraint" , "Release; gratis" , "Complimentary" , "unemployed" .)

I've seen this clue in the Evening Standard.
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