Gene Vincent's entertaining show (6)
I believe the answer is:
evince
'show' is the definition.
(I know that show can be written as evince)
'gene vincent's entertaining' is the wordplay.
'entertaining' indicates a hidden word.
'EVINCE' can be found hidden inside 'gene vincents'.
(Other definitions for evince that I've seen before include "Show or display, say feeling" , "Show or reveal, say interest" , "Make evident" , "Express, show" , "Indicate (something)" .)