Well filled-in tax form showing the nice profit (4,6)

I believe the answer is:

good return

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'well filled-in tax form showing' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'nice profit' is the wordplay.
'nice' becomes 'good' (similar in meaning).
'profit' becomes 'return' (I've seen this before).
'good'+'return'='GOOD RETURN'

'the' is the link.

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I've seen this clue in the Evening Standard.

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