Closes off connection working on Saturday (7)

I believe the answer is:

cordons

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'closes' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe there's an association between them I don't understand?

'off connection working on saturday' is the wordplay.
'off connection working' becomes 'cord' (I am not sure about this - if you are sure you should believe this answer much more).
'saturday' becomes 's'.
'cord'+'on'+'s'='CORDONS'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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