Mould, sculpt (5)
I believe the answer is:
shape
I believe this is a double definition.
'mould' is the first definition.
(I know that cast is a kind of shape)
'sculpt' is the second definition.
(I know that sculpt is a kind of shape)
(Other definitions for shape that I've seen before include "Phase (anag.)" , "External form" , "Good physical form" , "Mould into new phase" , "Heaps (anag.)" .)