Son packed and went off (8)

I believe the answer is:

scrammed

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'went off' is the definition.
The definition and answer can be both to do with motion as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?

'son packed' is the wordplay.
'son' becomes 's'.
'packed' becomes 'crammed' ('cram' can be a synonym of 'pack').
's'+'crammed'='SCRAMMED'

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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