Go, vacillating varlet! (6)
I believe the answer is:
travel
'go' is the definition.
('travel' can be a synonym of 'go')
'vacillating varlet' is the wordplay.
'vacillating' is an anagram indicator.
'varlet' anagrammed gives 'TRAVEL'.
(Other definitions for travel that I've seen before include "tour" , "It is said to broaden the mind" , "Movement from one place to another" , "Go on a trip" , "Move from one place to another" .)