Headstone? (5)
I believe the answer is:
cameo
'headstone?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
This is all the clue.
Can you help me to learn more?
(Other definitions for cameo that I've seen before include "Something small but well done - say role in play" , "Small but interesting role" , "relief work" , "Medallion with a profile carved in relief" , "Ornament or miniature performance" .)