Crossword Genius

Dad's double (4)

Ross

I believe the answer is:

papa

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This could be a double definition.

'dad's' is the first definition.
(synonyms)

'double' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for papa that I've seen before include "Mama's other half?" , "Daddy]" , "Dad" , "The old man" , "Comms code for 'P'" .)

I've seen this clue in the Evening Standard.
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