Pros in sort of jail (6)
I believe the answer is:
prison
'jail' is the definition.
(I've seen this before)
'pros in sort' is the wordplay.
'sort' is an anagram indicator.
'pros'+'in'='prosin'
'prosin' with letters rearranged gives 'PRISON'.
'of' is the link.
(Other definitions for prison that I've seen before include "Stir - can" , "Nick" , "Correctional institution" , "Wormwood Scrubs, for example" , "Slammer" .)