Secret appears to have been exposed (4,2,6)

'exposed' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'secret appears to have been' is the wordplay.
I cannot really see how this works, but
'secret' could be 'incamera' (legal term meaning in private, lit. 'in a chamber') and 'incamera' is located in the answer.
'been' could be 'held' (holding is a kind of being) and 'held' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?