None can match her goodness (3)
I believe the answer is:
nun
'none can' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nun that I've seen before include "nuisance in pine forest" , "Convent dweller" , "Member of religious order" , "Religious sister" , "A palindromic holy woman" .)