Loaf, perhaps, a dishonest thing to do (5)
I believe the answer is:
twist
'do' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for twist that I've seen before include "See Oliver" , "Bend round; dance" , "Tobacco - fraud - unexpected development - dance" , "Turn - Dickensian" , "tobacco to chew?" .)