Head of fleet, docked, collapsed into bed (7)

I believe the answer is:

flopped

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

'bed' is the definition.
Although both the answer and definition are past participle verbs, I don't see how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for flopped that I've seen is " Failed".)

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.