Shame leaders have evinced (5)
I believe the answer is:
shown
'evinced' is the definition.
(I've seen this in another clue)
'shame leaders have' is the wordplay.
'shame leaders' becomes 'sh' (I can't justify this - if you can you should give a lot more credence to this answer).
'have' becomes 'own' (to have something is to own it).
'sh'+'own'='SHOWN'
Can you help me to learn more?
(Other definitions for shown that I've seen before include "Explained" , "Exhibited" , "Demonstrated" , "Displayed" .)