Nick's spin is working (6)
I believe the answer is:
prison
'nick's' is the definition.
(British slang)
'spin is working' is the wordplay.
'spin' becomes 'PR' (short for public relations - media spin).
'working' becomes 'on' (on can mean working or activated).
'pr'+'is'+'on'='PRISON'
(Other definitions for prison that I've seen before include "Stir - can" , "No rips (anag)" , "Penitentiary" , "Place of detention for criminals" , "Nick" .)