Falsified (7)
(Other definitions for trumped-up that I've seen before include "Concocted with intent to deceive" , "Invented, false" .)
(Other definitions for fiddled that I've seen before include "cheated" , "wasted time" , "Was corrupt" , "What Nero did while Rome burned" .)
'falsified' is the definition.
('fake' can be a synonym of 'falsify')
This is the entire clue.
(Another definition for faked that I've seen is " Counterfeit".)