American going to pieces behind closed doors

I believe the answer is:

in camera

I'm a little stuck... Click here to teach me more about this clue!

'behind closed doors' is the definition.
(legal term meaning in private, lit. 'in a chamber')

'american going to pieces' is the wordplay.
'american' anagrams to 'IN CAMERA'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for in camera that I've seen before include "Of courts, heard in judge's private room" , "American (anag) - not open" , "without full scrutiny?" , "Privately - American (anag)" , "'In private (2,6)'" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.