Paint birds catching cat by its head? (8)
I believe the answer is:
emulsion
'paint' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for emulsion that I've seen before include "Type of paint" , "Mixture involving two liquids which do not readily combine" , "Wall paint" , "Mixture of insoluble liquids" .)