Crossword Genius

A change of attire for number in opera (7)

Ross

I believe the answer is:

arietta

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'number in opera' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'a change of attire' is the wordplay.
'change of' indicates an anagram (the letter order is changed).
'attire' anagrammed gives 'rietta'.
'a'+'rietta'='ARIETTA'

'for' is the link.

Can you help me to learn more?

(Other definitions for arietta that I've seen before include "Little song" , "Little aria" , "number from opera" , "Short operatic number" , "Short operatic air" .)

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