Failed to agree and is despatched east into extremes of dread (9)

I believe the answer is:

dissented

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'failed to agree' is the definition.
I can't tell whether this definition defines the answer.

'is despatched east into extremes of dread' is the wordplay.
'despatched' becomes 'sent' (I've seen this before).
'east' becomes 'e' (synonyms).
'into' is an insertion indicator.
'extremes of' suggests removing the centre.
'dread' with its centre removed is 'dd'.
'is'+'sent'+'e'='issente'
'issente' put into 'dd' is 'DISSENTED'.

'and' is the link.

Can you help me to learn more?

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

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