Crossword Genius

Pop up repeatedly (3)

Ross

I believe the answer is:

dad

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'pop' is the definition.
(both can mean one's father)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for dad that I've seen before include "Popular and informal father" , "Pa" , "Papa" , "Father, in short" , "Old man" .)

I've seen this clue in the Evening Standard.
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