Artist in three-dimensional shapes (8)
I believe the answer is:
sculptor
'artist in three-dimensional shapes' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sculptor that I've seen before include "Rodin, perhaps" , "Maker of figures" , "Artist in stone, bronze etc" , "Creator of three-dimensional works of art" , "Epstein,say," .)