Available, as an apartment (7)

I believe the answer is:

ferment

(Other definitions for ferment that I've seen before include "Boil" , "Agitation, turbulence" , "Seethe or agitate, as when making alcohol (7)" , "Seethe with excitement or undergo organic change" , "Seething commotion" .)

I've seen this clue in The New York Times.

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