Deceive by a cunning deed, going round a left turn (6)
I believe the answer is:
delude
'deceive' is the definition.
(I know that deceive can be written as delude)
'a cunning deed going round a left turn' is the wordplay.
'a cunning deed' becomes 'dede' (I can't justify this - if you can you should give a lot more credence to this answer).
'going round' means one lot of letters goes inside another (some letters go around others).
'a left' becomes 'L' (common abbreviation).
'turn' becomes 'U' (a 'U-turn' is a kind of turn).
'l'+'u'='lu'
'dede' enclosing 'lu' is 'DELUDE'.
'by' is the link.
Can you help me to learn more?
(Other definitions for delude that I've seen before include "Mislead; deceive" , "Lead into false belief" , "Mislead in belief" , "Cause to believe something untrue, deceive" , "Mislead or fool" .)