Thoroughly thrash (9)

I believe the answer is:

horsewhip

(Other definitions for horsewhip that I've seen before include "He worship (anag) - lash" , "administer punishment" , "Beat, lash" , "thrash" , "Coachman's accessory" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.