Clear off without right racket (4)
I believe the answer is:
scam
'racket' is the definition.
(racket is a type of scam or scheme)
'clear off without right' is the wordplay.
'clear off' becomes 'scram' (both can be used to tell someone to go away).
'without' indicates named letters should be taken away.
'right' becomes 'r' (common abbreviation).
'scram' with 'r' removed is 'SCAM'.
(Other definitions for scam that I've seen before include "Fraudulent trick or swindle" , "Fraudulent business scheme" , "A slangy swindle or fraud" , "Dodgy business" , "ploy" .)