She has a high range of performance (7)
I believe the answer is:
soprano
'performance' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'she has a high range of' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is present in the answer.
'of' could be 'o' and 'o' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for soprano that I've seen before include "chorus girl, perhaps" , "(Singer of) the highest vocal range" , "Woman singing" , "Highly vocal musician" , "High singing voice" .)