Crossword Genius

Revealed first three are missing when shut (6)

Ross

I believe the answer is:

closed

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

'shut' is the definition.
(I know that shut can be written as closed)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for closed that I've seen before include "Shut" , "Resolved" , "successfully completed" , "Terminated" , "clinched the sale" .)

I've seen this clue in The Daily Express.
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.