Deliveries dispatched overlooking new disorder (7)

I believe the answer is:

overset

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'disorder' is the definition.
Both the definition and answer are verbs in their base form.
Perhaps there's a link between them I don't understand?

'deliveries dispatched overlooking new' is the wordplay.
'deliveries' becomes 'over' (a cricket over consists of six deliveries).
'dispatched' becomes 'sent' (I've seen this in another clue).
'overlooking' indicates named letters should be taken away.
'new' becomes 'n' (abbreviation as in New Testament NT).
'sent' with 'n' taken away is 'set'.
'over'+'set'='OVERSET'

Can you help me to learn more?

(Other definitions for overset that I've seen before include "disquiet" , "Disturbed" , "Put into disorder" .)

I've seen this clue in The Independent.

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