Undue pride shown by expert about right arrangement for organ (9)
I believe the answer is:
arrogance
'undue pride' is the definition.
'arrogance' can be an answer for 'pride' (arrogance is a kind of pride). I'm not certain of the 'undue' bit.
'expert about right arrangement for organ' is the wordplay.
'expert' becomes 'ace' (ace can informally mean very good).
'about' is an insertion indicator.
'right' becomes 'r' (common abbreviation).
'arrangement for' indicates anagramming the letters (I've seen this in other clues).
'organ' with letters rearranged gives 'rogan'.
'r'+'rogan'='rrogan'
'ace' going around 'rrogan' is 'ARROGANCE'.
'shown by' acts as a link.
Can you help me to learn more?
(Other definitions for arrogance that I've seen before include "Overbearing attitude of pride and insolence" , "Hauteur" , "Conceit, self-importance" , "Overweening self-importance" , "Overbearing conceit" .)