Pivot with endless upsurge in arrogance (6)
I believe the answer is:
hubris
'arrogance' is the definition.
(hubris is a kind of arrogance)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for hubris that I've seen before include "Overbearing pride or self-confidence" , "Excessive pride" , "Arrogant pride or presumption" , "Arrogant pride, from the Greek" , "show of arrogance" .)