Small part of a stone carving (5)
I believe the answer is:
cameo
This could be a double definition.
'small part' is the first definition.
(small part in a film)
'a stone carving' is the second definition.
'cameo' can be an answer for 'carving' (cameo is a kind of carving). I am not sure about the 'a stone' bit.
'of' is the link.
Can you help me to learn more?
(Other definitions for cameo that I've seen before include "Carved head on gem - short dramatic role for star" , "Small role - gem with a figure carved in relief" , "Medallion with a profile carved in relief" , "Miniature picture" , "Short performance" .)