Messily eat a Gü dessert, perhaps (6)
I believe the answer is:
gateau
'dessert perhaps' is the definition.
I can't tell whether this defines the answer.
'messily eat a gu' is the wordplay.
'messily' indicates anagramming the letters.
'eat'+'a'+'gu'='eatagu'
'eatagu' with letters rearranged gives 'GATEAU'.
Can you help me to learn more?
(Other definitions for gateau that I've seen before include "Rich cream cake" , "Creamy dessert cake" , "rich food" , "Black Forest dessert" , "Something French for 22?" .)