Making last point in sung composition (8,3)

I believe the answer is:

spinning out

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'making last point in sung composition' is the definition.
I can't tell whether this defines the answer.

'point in sung composition' is the wordplay.
'composition' indicates an anagram (letters arranged or composed in a different order).
'point'+'in'+'sung'='pointinsung'
'pointinsung' with letters rearranged gives 'SPINNING OUT'.

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I've seen this clue in The Times.

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