Taking a sample round, traffic it at Scene, feeling high (8)
I believe the answer is:
ecstatic
'feeling high' is the definition.
(ecstatic can mean feeling high or euphoric)
'taking a sample round traffic it at scene' is the wordplay.
'round' says the letters should be written in reverse.
'taking a sample' indicates the answer is hidden within the clue.
'citatsce' is hidden in the letters of 'traffic it at scene'.
'citatsce' backwards is 'ECSTATIC'.
(Other definitions for ecstatic that I've seen before include "Blissfully happy" , "Joyful" , "elated" , "On cloud nine" , "Full of bliss" .)