A pilot's uppishness? (8)
I believe the answer is:
altitude
'a pilot's uppishness?' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for altitude that I've seen before include "Height above sea-level" , "Angular distance above the horizon" , "Height above the earth's surface" , "high place" , "Height above sea level" .)