Integrity of conviction leads to criminal record being overturned (9)
I believe the answer is:
rectitude
'integrity' is the definition.
(I've seen this before)
'conviction leads to criminal record being overturned' is the wordplay.
I cannot quite see how this works, but
'record' could be 'rec' (I've seen this before) and 'rec' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for rectitude that I've seen before include "Moral integrity" , "Certitude about moral goodness" , "Strict propriety" , "Uprightness, integrity" , "Correctness" .)