Tied door shut? (10)

I believe the answer is:

deadlocked

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

'tied' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for deadlocked that I've seen before include "At a stalemate" , "Unable to get agreement" .)

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.