At a greater altitude (6)

I believe the answer is:
higher
(Other definitions for higher that I've seen before include "More lofty" , "Loftier" , "At greater altitude" , "More exalted" , "More elevated" .)
I believe the answer is:
higher
(Other definitions for higher that I've seen before include "More lofty" , "Loftier" , "At greater altitude" , "More exalted" , "More elevated" .)