Out of one’s depth (2,3)

I believe the answer is:

at sea

(Other definitions for at sea that I've seen before include "Confused, uncertain" , "Sailing - confused" , "floundering" , "Bewildered; sailing" , "stumped" .)

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.