Heads of university not scrutinised or is that not proven yet? (8)
I believe the answer is:
untested
'heads of university not scrutinised or is' is the definition.
I can't judge whether this defines the answer.
'not proven yet?' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'proven yet?' becomes 'tested' ('test' can be a synonym of 'prove'. I am not sure about the 'yet?' bit.**).
'un'+'tested'='UNTESTED'
'that' is the link.
Can you help me to learn more?
(Other definitions for untested that I've seen before include "Not tried or proven" , "Not checked" , "learner driver" , "Not yet proven" , "New" .)