Figure's toned and rather developed (11)
I believe the answer is:
tetrahedron
'figure's' is the definition.
(I've seen this before)
'toned and rather developed' is the wordplay.
'and' says to put letters next to each other.
'developed' indicates an anagram.
'toned' after 'rather' is 'rathertoned'.
'rathertoned' anagrammed gives 'TETRAHEDRON'.
(Other definitions for tetrahedron that I've seen before include "Pyramid" , "Four-faced solid" , "Four-sided figure" , "Solid with four triangular faces" , "Body with four triangular faces" .)