Crossword Genius

One brought them up to rebuke them on purpose (10)

Ross

I believe the answer is:

deliberate

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

'on purpose' is the definition.
(I've seen this before)

'one brought them up to rebuke them' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'rebuke' could be 'berate' (synonyms) and 'berate' is found within the answer.
The remaining letters 'del' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for deliberate that I've seen before include "Studied" , "Calculated - think carefully" , "Purposeful" , "debate" , "on purpose" .)

I've seen this clue in The Irish Times.
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