Guy is not a reputable source of news (3)
I believe the answer is:
rag
This clue could be a double definition.
'guy' is the first definition.
(both can mean to tease or mock)
'news' is the second definition.
(thesaurus)
'is not a reputable source of' acts as a link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for rag that I've seen before include "Piece of cloth and student fun" , "Play practical jokes on - worthless newspaper" , "Student carnival for charity" , "Duster, perhaps" , "students' excuse to misbehave?" .)