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Oliver's compositions? Fine examples (10)

Ross

I believe the answer is:

showpieces

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'fine examples' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

'oliver's compositions?' is the wordplay.
'oliver's' becomes 'show' (I can't explain this - if you can you should give a lot more credence to this answer).
'compositions?' becomes 'pieces' ('piece' can be a synonym of 'composition').
'show'+'pieces'='SHOWPIECES'

Can you help me to learn more?

I've seen this clue in The Guardian.
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