Excessive pride, arrogance (6)
I believe the answer is:
hubris
I believe this clue is a double definition.
'excessive pride' is the first definition.
(I've seen this in another clue)
'arrogance' is the second definition.
(I know that hubris is a type of arrogance)
(Other definitions for hubris that I've seen before include "Overreaching pride" , "having an extremely big head?" , "The pride that goeth before a fall" , "The pride that goes before a fall" , "Excessive pride" .)