Relating to the deepest parts of the ocean (5)
I believe the answer is:
hadal
(Another definition for hadal that I've seen is " at a deep level".)
I've seen this clue in the Thinks.com.
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.