Corrected when one re-invested (9)
I believe the answer is:
redressed
'corrected' is the definition.
('redress' can be a synonym of 'correct')
'one re-invested' is the wordplay.
I cannot quite understand how this works, but
're' is within the answer.
The remaining letters 'dressed' 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).
'when' acts as a link.
Can you help me to learn more?
(Other definitions for redressed that I've seen before include "having gone straight" , "Remedied" , "Given compensation" , "Made amends" , "Set right, often the balance" .)