Sample piece, nominally (3)
I believe the answer is:
sam
This clue could be a double definition.
'sample' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'piece nominally' is the second 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 can't see?
Can you help me to learn more?
(Other definitions for sam that I've seen before include "together once" , "Boy" , "Casablanca piano player" , "Uncle" .)