Operetta article somehow worried my wife (3,5,5)
I believe the answer is:
the merry widow
'operetta' is the definition.
(operetta by Franz Lehar)
'article somehow worried my wife' is the wordplay.
'article' becomes 'the' (the definite article in English).
'somehow' indicates an anagram.
'wife' becomes 'w'.
'worried'+'my'='worriedmy'
'worriedmy' anagrammed gives 'merrywido'.
'the'+'merrywido'+'w'='THE MERRY WIDOW'
(Other definitions for the merry widow that I've seen before include "Franz Lehar operetta" , "show" .)