One who leads a large number to sin (5)
I believe the answer is:
devil
'one who leads a large' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'number to sin' is the wordplay.
'number' becomes 'D' (D is an example).
'to sin' becomes 'evil' (I've seen this in another clue).
'd'+'evil'='DEVIL'
Can you help me to learn more?
(Other definitions for devil that I've seen before include "Coat spicily; do hackwork" , "Powerful evil spirit" , "Archfiend" , "Fiend" , "Demon" .)