Not many virtuous? Quite a lot in fact (1,4,3)
I believe the answer is:
a good few
'not many' is the definition.
'a good few' can be an answer for 'many' (I've seen this before). I am not certain of the 'not' bit.
'virtuous? quite a lot in fact' is the wordplay.
I cannot really understand how this works, but
'virtuous?' could be 'good' ('good' can be a synonym of 'virtuous') and 'good' is located in the answer.
'a' is present in the answer.
The remaining letters 'few' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for a good few that I've seen is " Many".)