Crossword Genius

Ancestor's eminent public address (7)

Ross

I believe the answer is:

grandpa

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'ancestor's' is the definition.
(grandpa is a kind of ancestor)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grandpa that I've seen before include "Veteran" , "Pop" , "Parent's father" , "Old man" , "much older relative?" .)

I've seen this clue in the Sydney Morning Herald.
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