Terra firma (5)
(Other definitions for land that I've seen before include "part of surface" , "Come down; territory" , "Lift with ropes and pulleys" , "Terrain" , "people" .)
(Other definitions for earth that I've seen before include "Land" , "Terrestrial sphere" , "Lair; planet" , "underground shelter" , "Familiar example of 1 Across" .)