Spittle mixed with mucus (6)

I believe the answer is:

sputum

(Other definitions for sputum that I've seen before include "Stuff ejected from the mouth" , "Phlegm" , "Mouth moisture, spittle" , "Matter that is spat out" , "Expectorated matter" .)

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.