The most common and most likely answer to this crossword clue is the 6 plus 4 letter word BEHIND BARS
I've seen this crossword clue in The Times
B
E
H
I
N
D
B
A
R
S
More clues leading to the result BEHIND BARS
- Responsible for some music not being free
- Wrap filled with what? Some chocolate inside
- In prison, where landlords ought to be?
- Where local workers are detained
- Female deer with bleeding head tolerates trapping in cage
- . Supporting pubs in lockdown?
- Where drinks may be served in prison
- Inside after going to pubs
- Where crooked landlords are, or should be
- Where alcohol is kept locked up
Buddy explains!

The straight part
We know that "inside" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case inside = behind bars.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.