Small part of stone carving (5)
I believe the answer is:
cameo
This clue could 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'm unsure of the 'stone' bit.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for cameo that I've seen before include "Small acting role; item of jewellery" , "Carved head on gem - short dramatic role for star" , "Ornament or miniature performance" , "Something small but well done - say role in play" , "Brief role" .)