Nirvana single's featured in show (8)
I believe the answer is:
paradise
'nirvana' is the definition.
('paradise' can be a synonym of 'nirvana')
'single's featured in show' is the wordplay.
'single's' becomes 'is' (one).
'featured in' means one lot of letters goes inside another.
'show' becomes 'parade' (parade is a kind of show**).
'is' put within 'parade' is 'PARADISE'.
(Other definitions for paradise that I've seen before include "perfectly happy state" , "perfect place" , "Utopia" , "Place of utter bliss" , "Scene of bliss" .)