Unforgettable piece for singer James (4)

I believe the answer is:

etta

'singer james' is the definition.
(I've seen this in another clue)

'unforgettable piece' is the wordplay.
'piece' indicates a hidden word.
'ETTA' can be found hidden inside 'unforgettable'.

'for' acts as a link.

I've seen this clue in the Sydney Morning Herald.

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