Type of paint (5)
'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" .)
(Other definitions for gloss that I've seen before include "explanation for obscure word" , "Provide explanations" , "Very shiny finish" , "translation" , "marginal note" .)