Pop round at six, boy (5)

I believe the answer is:

david

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'boy' is the definition.

'pop round at six' is the wordplay.
'pop' becomes 'da' (both can mean someone's father).
'round at six' becomes 'vid' (I can't explain this - if you can you should give a lot more credence to this answer).
'da'+'vid'='DAVID'

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(Other definitions for david that I've seen before include "Hebrew king" , "Dickens hero" , "Goliath's slayer" , "The Psalmist" , "King of Judah and Israel, Saul's successor" .)

I've seen this clue in the Evening Standard.

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