Crossword Genius

Such letters do not form such mail (5)

Ross

I believe the answer is:

chain

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'mail' is the definition.
(synonyms)

'such letters do not form' is the wordplay.
I cannot quite understand how this works, but
'form' could be 'chai' (I have seen 'Form of tea ' mean 'chai' so perhaps 'form' could also mean 'chai') and 'chai' is found within the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'such' acts as a link.

Can you help me to learn more?

(Other definitions for chain that I've seen before include "Paper decoration" , "British biochemist identified?" , "Series of connected links" , "Succession" , "Connected sequence" .)

I've seen this clue in the Evening Standard.
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