Highly disdainful (5)
I believe the answer is:
lofty
'disdainful' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for lofty that I've seen before include "Very high" , "Haughty" , "Tall, arrogant" , "Such ideals" , "Noble; aloof" .)