The early morning rush (4,6)

I believe the answer is:

dawn attack

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'the early' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'morning rush' is the wordplay.
'morning' becomes 'dawn' (synonyms).
'rush' becomes 'attack' (I've seen this in another clue).
'dawn'+'attack'='DAWN ATTACK'

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I've seen this clue in the Evening Standard.

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