Responsibility shown while making documentary, though Cameron won't participate (4)
I believe the answer is:
duty
'responsibility' is the definition.
(I know that responsibility can be written as duty)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for duty that I've seen before include "Financial or work obligation" , "form of tax" , "work you are obliged to do" , "Not subject to customs tax" , "A tax; compulsory task" .)