Crossword Genius

Paint birds catching cat by its head? (8)

Ross

I believe the answer is:

emulsion

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'paint' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(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" .)

I've seen this clue in The Times.
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