Kick oneself for
I believe the answer is:
regret
'kick oneself for' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for regret that I've seen before include "Rue - remorse" , "Feel repentance or disappointment" , "Compunction" , "Be contrite about" , "Be sorry for, wish it hadn't happened" .)