Klutz's comment (4)
I believe the answer is:
oops
'klutz's comment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oops that I've seen before include "Exclamation recognising a mistake has been made" , "Exclamation of making a blunder" , "Exclamation on making minor error" , "Oh dear, that's a mistake!" , "I'm sorry" .)