Foolish talk (6)
I believe the answer is:
drivel
'foolish talk' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for drivel that I've seen before include "Claptrap" , "Worthless, foolish nonsense" , "Stuff and nonsense" , "Verbal nonsense, rubbish" , "Slaver" .)