Eccentric person not natural, perhaps, as cheat (4-5)

I believe the answer is:

card-sharp

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'as cheat' is the definition.
'card sharp' can be an answer for 'cheat' (I've seen this before). I am not certain of the 'as' bit.

'eccentric person not natural' is the wordplay.
'eccentric person' becomes 'card' (card can informally mean an eccentric).
'not natural' becomes 'sharp' ('sharp' is the opposite to 'natural').
'card'+'sharp'='CARD-SHARP'

'perhaps' is the link.

Can you help me to learn more?

(Another definition for card-sharp that I've seen is " playing fiddler?".)

I've seen this clue in The Independent.

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