Off-shore ecosystem (5,4)
I believe the answer is:
coral reef
(Another definition for coral reef that I've seen is " Navigational hazard in warm seas - real force (anag)".)
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.