Prepared to be crazy before daybreak (4,5)

I believe the answer is:

made ready

'prepared' is the definition.
('make ready' can be a synonym of 'prepare')

'crazy before daybreak' is the wordplay.
'crazy' becomes 'mad' ('mad' can be a synonym of 'crazy').
'before' becomes 'ere' (usually literary).
'daybreak' becomes 'ady' (ady is day anagrammed 'broken').
'mad'+'ere'+'ady'='MADE READY'

'to be' is the link.

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