There's many a wicked one (5)

I believe the answer is:

devil

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'a wicked one' is the definition.
(I've seen this in another clue)

'there's many' is the wordplay.
'there's' becomes 'devi' (I can't explain this - if you can you should give a lot more credence to this answer).
'many' becomes 'l'.
'devi'+'l'='DEVIL'

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(Other definitions for devil that I've seen before include "Lucifer" , "Unsurpassed" , "Imp" , "Terror" , "Wicked person" .)

I've seen this clue in the Evening Standard.

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