Clue: Fat beer tum wobbles in passionately produced opera (6,9)
Answer: MADAME BUTTERFLY
Explanation: Definition: opera
An envelope ('in') of AMEBUTTERF, an anagram ('wobbles') of 'fat beer tum' in MADLY ('passionately'). Puccini's opera is titled in Italian *Madama Butterfly*. but this is the common English rendering.