Smear carelessly (4)
I believe the answer is:
daub
'smear carelessly' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for daub that I've seen before include "Carelessly spread (paint)" , "coat casually" , "Amateurish painting" , "Do graffiti" , "Smear; plaster" .)