Popular smoothie veggie (4)

I believe the answer is:

kale

(Other definitions for kale that I've seen before include "Crinkle-leaf cabbage" , "Cabbage variety" , "Crinkled-leaf cabbage" , "Cabbage in a lake" , "Something green" .)

I've seen this clue in the LA Times.

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.