Drop of paint (4)
I believe the answer is:
blob
'drop of paint' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for blob that I've seen before include "Indistinct shape" , "Drop of thick liquid or viscous substance" , "Something small, soft and round" , "Soft globule" , "Small piece signifying nothing" .)