Arrange and keep protection for one praying? (7)

I believe the answer is:

kneepad

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

'protection for one praying?' is the definition.
I can't tell whether this definition defines the answer.

'arrange and keep' is the wordplay.
'arrange' is an anagram indicator.
'and'+'keep'='andkeep'
'andkeep' is an anagram of 'KNEEPAD'.

Can you help me to learn more?

(Other definitions for kneepad that I've seen before include "Joint guard" , "protection for joints" .)

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.