Stuck-up, being above the neighbouring level (5)
I believe the answer is:
proud
'stuck-up' is the definition.
(similar in meaning)
'being above the neighbouring level' is the wordplay.
I cannot quite understand how this works, but
'being' could be 'pro' (pro is a kind of being) and 'pro' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for proud that I've seen before include "Having a high opinion of oneself" , "Feeling self-respect - projecting from a surface" , "Self-respect, feeling of self-worth" , "Conscious of one's own dignity" , "Self-respecting or self-important" .)