Type of filling (5)
I believe the answer is:
inlay
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">type of filling</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 inlay that I've seen before include "Embedded decoration" , "Filling shaped to fit a tooth cavity" , "Mix images" , "Type of woodwork" , "Decoration of a surface by inserting wood, stone or metal" .)