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Words on parting very much in need of a trim? (2,4)

Ross

I believe the answer is:

so long

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'words on parting' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'very much in need of a trim?' is the wordplay.
'very much' becomes 'so'.
'in need of a trim?' becomes 'long' (I can't justify this - if you can you should believe this answer much more).
'so'+'long'='SO LONG'

Can you help me to learn more?

(Other definitions for so long that I've seen before include "Goodbye (colloq.)" , "Ta-Ta!" , "That length - goodbye!" , "Adieu" , "This extended" .)

I've seen this clue in The Telegraph.
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