Sat upon an enemy of good (5)

I believe the answer is:

satan

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'enemy of good' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'sat upon an' is the wordplay.
'upon' is a charade indicator (letters next to each other).
'sat'+'an'='SATAN'

Can you help me to learn more?

(Other definitions for satan that I've seen before include "Diabolical figure" , "Fiend" , "Old Nick, Lucifer or Beelzebub" , "Fallen archangel" , "The devil, Beelzebub" .)

I've seen this clue in The Globe and Mail.

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