The loftiness of Leo's lot? (5)
I believe the answer is:
pride
'the loftiness' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pride that I've seen before include "Company of lions" , "They say it comes before a fall" , "cause of swelling?" , "Leonine family" , "Arrogance - self-respect" .)