Do something carelessly or badly (6)
I believe the answer is:
bungle
'do something carelessly or badly' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bungle that I've seen before include "Make a hash of the job" , "Blunder" , "Tackle clumsily and fail" , "Botch; failure" , "(Make an) embarrassing mistake" .)