Hang for having shotgun in part of Las Vegas (6,2)
I believe the answer is:
string up
'hang' is the definition.
(synonyms)
'having shotgun in part of las vegas' is the wordplay.
'having shotgun' becomes 'ngu' (I can't explain this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'part of las vegas' becomes 'strip' (Las Vegas Strip).
'ngu' going into 'strip' is 'STRING UP'.
'for' acts as a link.
(Other definitions for string up that I've seen before include "Carry out death sentence" , "Hang" .)