A spiny globular echinoderm (3,6)

I believe the answer is:

sea urchin

(Other definitions for sea urchin that I've seen before include "Marine creature with near-spherical spiny shell" , "Marine invertebrate - enrich USA (anag)" , "marine echinoderm" , "Shelled marine creature" , "Marine animal with globular body" .)

I've seen this clue in The 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.