Vegetarian's showpiece (4)
I believe the answer is:
aria
'showpiece' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'vegetarian's' is the wordplay.
'ARIA' is hidden in amongst the letters.
However, I'm unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for aria that I've seen before include "Elaborate accompanied song for solo voice" , "Refrain" , "Nessun Dorma, for example" , "Operatic part" , "Imitative art work" .)