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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