Drug gets rodents off their face (3)

I believe the answer is:

ice

I'm a little stuck... Click here to teach me more about this clue!

'drug' is the definition.
(I know that ice is a type of controlled substance)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ice that I've seen before include "Cool down" , "Decorate with frosting" , "Do cake decoration" , "dessert" , "Some number" .)

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.