Crossword Genius

Grandpa entertaining party over sponsor? (9)

Ross

I believe the answer is:

godfather

'sponsor?' is the definition.
(I know that Godfather is a type of godparent)

I don't understand the rest of the clue.

(Other definitions for godfather that I've seen before include "Mafia chief or spiritual parent" , "He sponsors a child at baptism" , "He's a sponsor at Baptism" , "Baptismal sponsor" , "Mafia boss" .)

I've seen this clue in The Guardian.
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