Quite a lot - or some - of the curate's egg? (4,4)

I believe the answer is:

good part

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'quite a lot or some' is the definition.
I can't tell whether this defines the answer.

'the curate's egg?' is the wordplay.
'the curate's' becomes 'good' (I can't justify this - if you can you should give a lot more credence to this answer).
'egg?' becomes 'part' (egg is a kind of part).
'good'+'part'='GOOD PART'

'of' is the link.

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