Be a dick, hustle vagrant (6)
I believe the answer is:
sleuth
'be a dick' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'hustle vagrant' is the wordplay.
'vagrant' indicates anagramming the letters (vagrant can mean wandering around).
'hustle' is an anagram of 'SLEUTH'.
Can you help me to learn more?
(Other definitions for sleuth that I've seen before include "Hustle like detective (6)" , "See detective" , "Hustle (anag)" , "Gumshoe" , "Sherlock Holmes, for example" .)