Crossword Genius

Possibly crude painting (3)

Ross

I believe the answer is:

oil

This clue is a double definition.

'possibly crude' is the first definition.
(crude oil is a type of oil)

'painting' is the second definition.
(oil painting is a kind of painting)

(Other definitions for oil that I've seen before include "Lubricate; fuel" , "Cooking agent" , "Valuable viscous liquid" , "Type of fuel" , "Liquid fuel" .)

I've seen this clue in The Times.
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