Crossword Genius

With repetition of first part, contrive changes to sentence again (9)

Ross

I believe the answer is:

reconvict

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

'with repetition of first part contrive changes to sentence' is the definition.
I can't judge whether this definition defines the answer.

'again' is the wordplay.
I cannot really understand how this works, but
'again' could be 're' (prefix meaning 'again') and 're' is found in the answer.
The remaining letters 'convict' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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