Quizzes father of mule smuggling ketamine (4)
I believe the answer is:
asks
'quizzes' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for asks that I've seen before include "Puts a question" , "Begs" , "Enquires; requests" , "Requests information about" , "is curious" .)