Vegas trickster's entertaining a sort of band (7)
I believe the answer is:
gastric
'a sort of band' is the definition.
(gastric band)
'vegas trickster's entertaining' is the wordplay.
'entertaining' indicates a hidden word.
'GASTRIC' is hidden within 'vegas tricksters'.
(Other definitions for gastric that I've seen before include "Abdominal" , "Pertaining to the stomach" , "Intestinal" , "Relating to or involving the stomach" , "affecting stomach" .)