Old Nick was enthroned on one (5)

I believe the answer is:

satan

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'old nick' is the definition.
(I know that old nick can be written as Satan)

'enthroned on one' is the wordplay.
'enthroned on' becomes 'sat' (I can't explain this - if you can you should give a lot more credence to this answer).
'one' becomes 'an' (an apple is one apple).
'sat'+'an'='SATAN'

'was' acts as a link.

Can you help me to learn more?

(Other definitions for satan that I've seen before include "Old Nick, Lucifer or Beelzebub" , "Apollyon" , "Fallen archangel" , "arch-fiend" , "Diabolical figure" .)

I've seen this clue in the Evening Standard.

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