Prisoners go out in sequence (11)
I believe the answer is:
progression
'sequence' is the definition.
(thesaurus)
'prisoners go out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'prisoners'+'go'='prisonersgo'
'prisonersgo' with letters rearranged gives 'PROGRESSION'.
'in' acts as a link.
(Other definitions for progression that I've seen before include "Gradual advancement" , "(Mathematical) sequence" , "Forward motion" , "Gradual development" .)