Want to drop page journalist replaced when editing? (9)

I believe the answer is:

overtyped

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'replaced when editing?' is the definition.
(typed new text over old text)

'want to drop page journalist' is the wordplay.
I cannot really see how this works, but
'page' could be 'p' and 'p' is found in the answer.
'journalist' could be 'ed' (short for editor) and 'ed' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Times.

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