Post a letter to finish with (4)

I believe the answer is:

send

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'post' is the definition.
(synonyms)

'a letter to finish with' is the wordplay.
'a letter' becomes 's'.
'to' is a charade indicator (letters next to each other).
'finish with' becomes 'end' (come to an end. I am not sure about the 'with' bit.).
's'+'end'='SEND'

Can you help me to learn more?

(Other definitions for send that I've seen before include "Despatch, remit" , "Forward" , "Dispatch by post" , "and 2: Advise" , "Consign" .)

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