Crossword Genius

Sample piece, nominally (3)

Ross

I believe the answer is:

sam

I'm a little stuck... Click here to teach me more about this clue!

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" .)

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