The end of the series spoiled a fine production (5,7)

I believe the answer is:

final episode

'the end of the series' is the definition.
(last episode of a TV series)

'spoiled a fine production' is the wordplay.
'production' indicates anagramming the letters.
'spoiled'+'a'+'fine'='spoiledafine'
'spoiledafine' anagrammed gives 'FINAL EPISODE'.

I've seen this clue in The Guardian.

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