Newspaper describes America's Got Talent's big characters for the commoners (6)
I believe the answer is:
ragtag
'for the commoners' is the definition.
(ragtag can mean common or informal)
'newspaper describes america's got talent's big characters' is the wordplay.
'newspaper' becomes 'rag' (informal term for a newspaper).
'describes' means one lot of letters goes inside another (describe can mean to form the outline of).
'big characters' says to take the initial letters (capital letters).
The initial letters of 'americas got talents' is 'agt'.
'rag' going around 'agt' is 'RAGTAG'.
(Other definitions for ragtag that I've seen before include "Mob" , ". . . . . . and bobtail, the rabble" , "hoi polloi" , "Scruffy" , "Disreputable group of people" .)