Content behind bars? (6)
I believe the answer is:
inside
'behind bars?' is the definition.
(inside can mean in prison)
'content' is the wordplay.
I cannot quite understand how this works, but
'content' could be 'side' (side is a kind of content) and 'side' is found in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for inside that I've seen before include "Inner surface" , "serving porridge" , "Enid is (anag) - within" , "Middle" , "Internal" .)