Crossword Genius

A lion disrupted the operetta (8)

Ross

I believe the answer is:

iolanthe

'operetta' is the definition.
(I know that Iolanthe is a operetta)

'a lion disrupted the' is the wordplay.
'disrupted' indicates an anagram.
'a'+'lion'='alion'
'alion' anagrammed gives 'iolan'.
'iolan'+'the'='IOLANTHE'

(Other definitions for iolanthe that I've seen before include "G&S piece" , "G & S' alternative for "The Peer and the Peri"" , "show" , "Staged work" , "G&S operetta" .)

I've seen this clue in The Globe and Mail.
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