Crossword Genius

In public address, the dear old chap repeats himself (4)

Ross

I believe the answer is:

papa

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'in public address the dear old chap' is the definition.
I can't tell whether this defines the answer.

'repeats himself' is the wordplay.
'repeats' indicates the doubling of some letters.
'himself' becomes 'pa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pa' duplicated is 'PAPA'.

Can you help me to learn more?

(Other definitions for papa that I've seen before include "Father; letter P" , "The old man" , "Dad" , "Daddy]" , "one after Oscar" .)

I've seen this clue in the Evening Standard.
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