A prose composition dramatic and musical! (6)

I believe the answer is:

operas

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'dramatic and musical' is the definition.
I can't judge whether this defines the answer.

'a prose composition' is the wordplay.
'composition' indicates anagramming the letters.
'a'+'prose'='aprose'
'aprose' is an anagram of 'OPERAS'.

Can you help me to learn more?

(Other definitions for operas that I've seen before include "'La Boheme and La Traviata, say (6)'" , "Dramatic musicals in which words are sung" , "Musical performances" , "They're written by 1 across" , "The Magic Flute, Don Giovanni etc" .)

I've seen this clue in the Evening Standard.

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