Crossword Genius

Main reason corrupt Reagan's deposed? (3)

Ross

I believe the answer is:

sea

I'm a little stuck... Click here to teach me more about this clue!

'main' is the definition.
(the main is an old name for the sea)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sea that I've seen before include "The deep" , "one may be pounding the beach" , "Expanse of salt water" , "Ocean area" , "Lesser ocean" .)

I've seen this clue in The Guardian.
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.