American breaks down behind closed doors (8)

I believe the answer is:

incamera

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'down behind closed doors' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'american breaks' is the wordplay.
'breaks' indicates anagramming the letters.
'american' is an anagram of 'INCAMERA'.

Can you help me to learn more?

(Another definition for incamera that I've seen is " kept secret".)

I've seen this clue in The Irish Times.

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