Clean coat used by artist (4)
I believe the answer is:
wash
This could be a double definition.
'clean' is the first definition.
(washing is a kind of cleaning)
'coat used by artist' is the second definition.
'wash' can be an answer for 'coat' (thesaurus). I'm not certain of the 'used by artist' bit.
Can you help me to learn more?
(Other definitions for wash that I've seen before include "Bathe" , "Stand up" , "Clean oneself" , "Of animals, cleanse by licking" , "shower" .)