Brother returned short letter to person from Brest (6)

I believe the answer is:

breton

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'person from brest' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'brother returned short letter' is the wordplay.
'brother' becomes 'br'.
'returned' shows that the letters should be reversed in order.
'short letter' becomes 'note' (synonyms).
'note' back-to-front is 'eton'.
'br'+'eton'='BRETON'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for breton that I've seen before include "Person from Brittany" , "Inhabitant of NW France" , "from Northern France" , "French language class" , "Surrealist" .)

I've seen this clue in The Guardian.

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