Crossword Genius

Copper's answer is ending (11)

Ross

I believe the answer is:

dissolution

'is ending' is the definition.
(thesaurus)

'copper's answer' is the wordplay.
'copper's' becomes 'DI's' (detective inspector, type of copper).
'answer' becomes 'solution' (synonyms).
'dis'+'solution'='DISSOLUTION'

(Another definition for dissolution that I've seen is " Dissipation; death".)

I've seen this clue in The Times.
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