Crossword Genius

Old PM happy to dispense biblical justice? (9)

Ross

I believe the answer is:

gladstone

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

'old pm' is the definition.
'gladstone' can be an answer for 'pm' (William Gladstone). I am not sure about the 'old' bit.

'happy to dispense biblical justice?' is the wordplay.
I cannot really see how this works, but
'happy' could be 'glad' (similar in meaning) and 'glad' is found within the answer.
'to' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for gladstone that I've seen before include "5,27 [PRIME MINISTER]" , "PM no longer" , "Liberal leader" , "Former English PM or kind of bag" , "Victorian PM" .)

I've seen this clue in The Sun.
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