Eccentric chap of greater astuteness, a cheat (11)
I believe the answer is:
cardsharper
'cheat' is the definition.
(cardsharper is a kind of cheat)
'eccentric chap of greater astuteness a' is the wordplay.
'eccentric' becomes 'card' (card can mean an eccentric person).
'chap of greater astuteness' becomes 'shar' (I can't explain this - if you can you should give a lot more credence to this answer).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'card'+'shar'+'per'='CARDSHARPER'
Can you help me to learn more?
I've seen this clue in The Times.
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