Crossword Genius

Supplication of one on his knees (6)

Ross

I believe the answer is:

prayer

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

'supplication' is the definition.
(I know that supplication can be written as prayer)

'one on his knees' is the wordplay.
I cannot really understand how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
The remaining letters 'pryer' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

(Other definitions for prayer that I've seen before include "Address to god" , "Earnest request" , "Supplication ot God" , "Collect - petition" , "Act of supplication to a deity" .)

I've seen this clue in the Evening Standard.
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