Gobbledegook (5,5)
I believe the answer is:
mumbo jumbo
'gobbledegook' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for mumbo jumbo that I've seen before include "Ritual intercourse" , "Gobbledegook" , "Claptrap" , "Mysterious speech" , "gibberish" .)