The most common and most likely answer to this crossword clue is the 8 letter word CLOSETED
I've seen this crossword clue in The Guardian
C
L
O
S
E
T
E
D
More clues leading to the result CLOSETED
- Tool muffling echo on TV in confined space
- Secret codes let out
- Idiot taking assigned drug shut up
- Last of those coldest tumbledown houses shut off
- Key Latin dictionary ready to be loaded in camera
- Mean 50s lout shut away
- Tight-lipped and tense editor shut away
- Near Theodore, in a small room
- Going through clinic, lose Teddy in a small room
- Miss note during recording — thus shut up!
Buddy explains!

The straight part
We know that "in camera" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in camera = closeted.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CLOSETED mean?
CLOSETED adjective- Not open about one's sexual orientation, romantic orientation, or gender identity.
- (by extension) Not open about some aspect of one's identity, tendency or fondness; secret.
- To shut away for private discussion.
- To put into a private place for a secret interview or interrogation.
- To shut up in, or as in, a closet for concealment or confinement.
- Confined.
- Sheltered, protected