Gobbledygook (9)
I believe the answer is:
gibberish
'gobbledygook' is the definition.
(I know that gobbledygook can be written as gibberish)
This is the entire clue.
(Other definitions for gibberish that I've seen before include "Tosh" , "Unintelligible talk, nonsense" , "Meaningless speech" , "Meaningless talk" , "moonshine" .)