Accident report? (4)
I believe the answer is:
oops
'accident report?' 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 "statement after accident" , "Silly me, I've dropped something!" , "Something's been spilt!" , "Exclamation of surprise or apology when making mistake" , "Exclamation after mistake or minor accident" .)