Crossword Genius

Where caps are when begging? (2,4,5)

Ross

I believe the answer is:

on ones knees

'begging?' is the definition.
(as in kneeling and begging)

'where caps are when' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

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

I've seen this clue in The Guardian.
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