Crossword Genius

One who preys on the one who went before? (8)

Ross

I believe the answer is:

predator

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

'one who went before?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'one who preys on' is the wordplay.
I cannot really see how this works, but
'one' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is present in the answer.
'who' could be 'dr' (from TV series Doctor Who) and 'dr' is present in the remaining letters.
The remaining letters 'pre' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'the' is the link.

Can you help me to learn more?

(Other definitions for predator that I've seen before include "Animal that preys on others" , "Animal that eats others" , "Animal that lives on others" , "Marauding creature" , "Hunting animal" .)

I've seen this clue in the Sydney Morning Herald.
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