American getting changed behind closed doors (2,6)
I believe the answer is:
in camera
'behind closed doors' is the definition.
(legal term meaning in private, lit. 'in a chamber')
'american getting changed' is the wordplay.
'getting changed' indicates an anagram.
'american' anagrammed gives 'IN CAMERA'.
(Other definitions for in camera that I've seen before include "Film would get put here" , "(Held) in private" , "With public absent" , "Where you find digital pictures" , "With press and public excluded" .)