Bent on submission (2,4,5)

I believe the answer is:

on ones knees

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

'submission' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'bent on' is the wordplay.
I cannot quite see how this works, but
'on' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for on ones knees that I've seen is " At a low point - praying?".)

I've seen this clue in The Globe and Mail.

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.