One capable of many a sin (5)

I believe the answer is:

devil

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'one capable of' is the definition.
The definition suggests a singular noun which matches the answer.

'many a sin' is the wordplay.
'many' becomes 'd'.
'a sin' becomes 'evil' (I've seen this before).
'd'+'evil'='DEVIL'

Can you help me to learn more?

(Other definitions for devil that I've seen before include "Terror" , "See 11" , "Coat spicily; do hackwork" , "Old Nick, Satan" , "Demon" .)

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