Sculptures possibly in bronze material (6)
I believe the answer is:
tartan
'material' is the definition.
(I know that tartan is a type of material)
'sculptures possibly in bronze' is the wordplay.
'sculptures possibly' becomes 'rta' (I can't explain this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'bronze' becomes 'tan' (both can mean to get a sun tan).
'rta' placed into 'tan' is 'TARTAN'.
Can you help me to learn more?
(Other definitions for tartan that I've seen before include "Ship in Mediterranean" , "Criss-cross pattern" , "Cloth with a crisscross design" , "Scots patterned cloth" , "Scottish costume design" .)