Crossword Genius

Something added is a letter dictated (6)

Ross

I believe the answer is:

annexe

I'm a little stuck... Click here to teach me more about this clue!

'something added' is the definition.
I can't judge whether this defines the answer.

'a letter dictated' is the wordplay.
'a' becomes 'an'.
'letter' becomes 'n'.
'dictated' becomes 'exe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'an'+'n'+'exe'='ANNEXE'

'is' is the link.

Can you help me to learn more?

(Other definitions for annexe that I've seen before include "Joined-on building" , "An addition to a document or building" , "Extra accommodation block" , "bit on the side?" , "Extension, supplement" .)

I've seen this clue in The Telegraph, The Times and The Independent.
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