Gag outspoken rascal (6)
I believe the answer is:
wretch
'rascal' is the definition.
(thesaurus)
'gag outspoken' is the wordplay.
'gag' becomes 'retch' (I've seen this in another clue).
'outspoken' shows a homophone (sound like).
'retch' is a homophone of 'WRETCH'.
(Other definitions for wretch that I've seen before include "Poor unfortunate soul" , "Poor devil" , "Someone to be pitied" , "Swine" , "Scoundrel" .)