Evidence of foul play from tabloids? No kidding! (10)
I believe the answer is:
bloodstain
'evidence of foul play' is the definition.
'bloodstain' can be an answer for 'evidence' (I have seen 'criminal evidence' mean 'bloodstain' so perhaps 'evidence' could also mean 'bloodstain'). I am unsure of the 'of foul play' bit.
'from tabloids? no kidding' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'no' becomes 'O' (O resembles 0).
'kidding' becomes 'n' (I can't justify this - if you can you should give a lot more credence to this answer).
'tabloids'+'o'='tabloidso'
'tabloidso' is an anagram of 'bloodstai'.
'bloodstai'+'n'='BLOODSTAIN'
Can you help me to learn more?
(Other definitions for bloodstain that I've seen before include "Discoloration" , "criminal evidence" , "One is potential evidence" , "Sign of an earlier wound" .)