Fool in ardour so changeable in opera (7,7)

I believe the answer is:

orlando furioso

'opera' is the definition.

'fool in ardour so changeable' is the wordplay.
'changeable' indicates anagramming the letters.
'fool'+'in'+'ardour'+'so'='foolinardourso'
'foolinardourso' with letters rearranged gives 'ORLANDO FURIOSO'.

'in' acts as a link.

(Another definition for orlando furioso that I've seen is " Classic poem".)

I've seen this clue in The Times.

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