Orca's home (3)
I believe the answer is:
sea
'orca's home' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sea that I've seen before include "& 14 Ozone" , "host of 1d [ADVENTURE]" , "Watery expanse" , "one may be pounding the beach" , "Division of an ocean" .)