Rembrandt works (4)
I believe the answer is:
oils
'rembrandt works' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oils that I've seen before include "Lubricates; paints" , "Soil, oddly, used by painters" , "7's paint medium" , "art exhibits perhaps" , "Well-produced" .)