Butterfingers' remark (4)
I believe the answer is:
oops
'butterfingers' remark' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oops that I've seen before include "Exclamation of making a blunder" , "Exclamation on making minor error" , "Exclamation on making obvious mistake" , "Apologetic exclamation" , "Exclamation recognising a mistake has been made" .)