Small part in a stone carving (5)
I believe the answer is:
cameo
This clue might be a double definition.
'small part' is the first definition.
(small part in a film)
'stone carving' is the second definition.
'cameo' can be an answer for 'carving' (cameo is a kind of carving). I am unsure of the 'stone' bit.
'in a' acts as a link.
Can you help me to learn more?
(Other definitions for cameo that I've seen before include "Carving in relief, on a brooch say" , "Item of jewellery with a portrait - distinguished actor's minor role" , "Small but interesting role" , "Piece of jewellery with carved portrait" , "Medallion with a profile carved in relief" .)