Spin senior put out is a con (8)
I believe the answer is:
prisoner
'a con' is the definition.
(I've seen this in another clue)
'spin senior put out' is the wordplay.
'spin' becomes 'PR' (short for public relations - media spin).
'put out' is an anagram indicator.
'senior' with letters rearranged gives 'isoner'.
'pr'+'isoner'='PRISONER'
'is' is the link.
(Other definitions for prisoner that I've seen before include "One inside" , "One is incarcerated" , "Person behind bars" , "Gaol inmate" , "Inmate doing porridge" .)