Lake in Hyde Park, London (10)

I believe the answer is:

serpentine

(Other definitions for serpentine that I've seen before include "London lake" , "Mineral; like a snake" , "Dark green mineral" , "like 21 [SNAKES]" , "Winding, twisting; mineral" .)

I've seen this clue in The Mirror.

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.