Fraud, trick (6)
I believe the answer is:
deceit
I believe this is a double definition.
'fraud' is the first definition.
(I've seen this before)
'trick' is the second definition.
(I have seen 'Dishonest trick ' mean 'deceit' so perhaps 'trick' could also mean 'deceit')
(Other definitions for deceit that I've seen before include "Hypocrisy" , "Fraud, cheating" , "Pretence, cheating" , "Cunning trickery" , "Lying" .)