Indian scholar not to mention in hell (6)
I believe the answer is:
pandit
'hell' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I don't see?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for pandit that I've seen before include "A learned Hindu, as Nehru was" , "Teacher" , "Honorary title of a Hindu scholar" , "Indian sage" , "Learned man of India" .)