Piece work (6)
I believe the answer is:
mosaic
'piece work' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mosaic that I've seen before include "Picture made up of small pieces of coloured glass or stones" , "Artistic design of glass or stones" , "Like the Commandments" , "Tessellated design" , "Design of many small pieces" .)