Evidence no longer in circulation wasted on tabloids (10)
I believe the answer is:
bloodstain
'evidence no longer in circulation' is the definition.
(blood no longer circulating in a person's body)
'wasted on tabloids' is the wordplay.
'wasted' indicates anagramming the letters.
'on'+'tabloids'='ontabloids'
'ontabloids' is an anagram of 'BLOODSTAIN'.
(Other definitions for bloodstain that I've seen before include "One is potential evidence" , "criminal evidence" , "Discoloration" , "Sign of an earlier wound" .)