Tooth filling (5)
I believe the answer is:
inlay
'tooth filling' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for inlay that I've seen before include "Decorative work" , "Decorate by embedding" , "Decoration of a surface by inserting wood, stone or metal" , "CD booklet" , "Embed" .)