Venial prof disrupted allegory (10)
I believe the answer is:
pardonable
'venial' is the definition.
(similar in meaning)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pardonable that I've seen before include "not too serious?" , "That may be forgiven" , "venial" , "Excusable" , "Capable of being forgiven" .)