Insulting poor poor nun -- this could be her (8,7)
I believe the answer is:
personal pronoun
'insulting poor poor nun' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'could be her' is the wordplay.
'could' becomes 'personal' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'be her' becomes 'pronoun' ('her' is a pronoun).
'personal'+'pronoun'='PERSONAL PRONOUN'
'this' acts as a link.
Can you help me to learn more?
(Other definitions for personal pronoun that I've seen before include "us, perhaps" , "Maybe we" , "We, say" .)