Crossword Genius

Rascal, one defended in part by curate? (1,3,3)

Ross

I believe the answer is:

a bad egg

I'm a little stuck... Click here to teach me more about this clue!

'curate?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'rascal one defended in part' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is found in the answer.
'part' could be 'egg' (egg is a kind of part) and 'egg' is present in the answer.
The remaining letters 'bad' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'by' acts as a link.

Can you help me to learn more?

(Other definitions for a bad egg that I've seen before include "Someone inherently dishonest" , "A worthless person (colloq.)" , "Unpleasant guy" , "One undesirable customer" , "one's worthless" .)

I've seen this clue in The Times.
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