I am sent unruly prisoners (7)
I believe the answer is:
inmates
'prisoners' is the definition.
(inmate is a kind of prisoner)
'i am sent unruly' is the wordplay.
'unruly' indicates an anagram.
'am'+'sent'='amsent'
'amsent' with letters rearranged gives 'nmates'.
'i'+'nmates'='INMATES'
(Other definitions for inmates that I've seen before include "Inhabitants" , "Prisoners" , "Ties man (anag.)" .)