Entertainer to practise deception in court? (8)
I believe the answer is:
conjuror
'entertainer' is the definition.
(I know that conjuror is a type of music interpreter)
'deception in court?' is the wordplay.
'deception' becomes 'con' (a con is a trick or deception).
'in court?' becomes 'juror' (I can't explain this - if you can you should give a lot more credence to this answer).
'con'+'juror'='CONJUROR'
'to practise' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for conjuror that I've seen before include "A sleight-of-hand entertainer" , "Man of magic tricks" , "One who might put woman in box" , "Performing magician" , "Trickster" .)