Blue movies a director conceals (3)
I believe the answer is:
sad
'blue' is the definition.
(I know that blue can be written as sad)
'movies a director conceals' is the wordplay.
'conceals' says the answer is hidden in the clue.
'SAD' is hidden in the letters of 'movies a director'.
(Other definitions for sad that I've seen before include "Heavy-hearted" , "Deplorable" , "Blue" , "Downcast" , "Unfortunate" .)