Type of paint (8)

I think it could be either:

Which length description are you looking for?:

emulsion

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

This is all the clue.

(Other definitions for emulsion that I've seen before include "Mixture involving two liquids which do not readily combine" , "Wall paint" , "Mixture of insoluble liquids" , "Type of paint" .)

I've seen this clue in the Evening Standard, The Times and The Telegraph.

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