Scold for getting the material overprocessed (7)

I believe the answer is:

reprove

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'scold' is the definition.
(I've seen this before)

'the material overprocessed' is the wordplay.
'the material' becomes 'rep' (rep is a kind of material).
'overprocessed' becomes 'rove' (I can't explain this - if you can you should give a lot more credence to this answer).
'rep'+'rove'='REPROVE'

'for getting' is the link.

Can you help me to learn more?

(Other definitions for reprove that I've seen before include "To remonstrate" , "Scold" , "Criticise" , "Admonish" , "Rebuke, censure" .)

I've seen this clue in the Evening Standard.

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