Clue: Loudly criticise pudding getting stick down under (9)
Answer: BOOMERANG
Explanation: Definition: stick down under
 **Homophone of**(Loudly) [ "boo!"(exclamation to criticise/show disapproval) + "meringue"(a pudding/a dessert made from egg whites and sugar) ].
Defn: …, in Australia, that is.