Hide what is needed for successful projecting (6)
I believe the answer is:
screen
'hide' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for screen that I've seen before include "Room divider" , "Censer (anag.)" , "Surface on which pictures are projected in cinemas" , "Blind - hide from view" , "Room partition; vet" .)