Painting on dry plaster (5)
I believe the answer is:
secco
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">painting on dry plaster</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for secco that I've seen before include "Painting technique on dry plaster" , "unaccompanied?" , "Dry (of wine)" .)