Hand bribes out in prison (6,4)
I believe the answer is:
behind bars
'in prison' is the definition.
(behind bars means locked away in prison)
'hand bribes out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'hand'+'bribes'='handbribes'
'handbribes' with letters rearranged gives 'BEHIND BARS'.
(Other definitions for behind bars that I've seen before include "In prison" , "inside" , "In jail" , "like some of the hotel staff?" , "tapsters" .)