Nominally a piano piece (3)

I believe the answer is:

ian

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'nominally a piano piece' is the definition.
I can't judge whether this definition defines the answer.

'nominally a piano piece' is the wordplay.
'piece' indicates a hidden word.
'IAN' can be found hidden inside 'nominally piano'.

Can you help me to learn more?

(Other definitions for ian that I've seen before include "- Botham, cricketer" , "Sir - McKellen, actor" , "The familiar Dr Paisley" , "Botham or Chappell?" , "- McEwan, Eng. writer" .)

I've seen this clue in the Evening Standard.

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