Crossword Genius

Don't notice that I have added to the letter (7)

Ross

I believe the answer is:

missive

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'the letter' is the definition.
(synonyms)

'don't notice that i have added' is the wordplay.
'don't notice' becomes 'miss' (I can't explain this - if you can you should give a lot more credence to this answer).
'that i have' becomes 'ive'.
'added' means one lot of letters go next to another.
'miss'+'ive'='MISSIVE'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for missive that I've seen before include "message" , "Letter" , "intelligence in this?" .)

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