Show vet (6)
I believe the answer is:
screen
I believe this clue is a double definition.
'show' is the first definition.
(screen can mean to show a film)
'vet' is the second definition.
(I've seen this before)
(Other definitions for screen that I've seen before include "show on TV" , "Partition; monitor" , "following 28 [SILVER]" , "Cover - cinema" , "Surface for projection of pictures" .)