Maybe envy what the Sistine Chapel has during conclave? (8,3)
I believe the answer is:
cardinal sin
'maybe envy what the sistine chapel' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'during conclave?' is the wordplay.
I cannot quite see how this works, but
'during' could be 'in' (e.g. during February means in February) and 'in' is found within the answer.
This explanation may well be incorrect...
'has' is the link.
Can you help me to learn more?
(Another definition for cardinal sin that I've seen is " fundamental foul-up".)