Dad's dad (7)

I think it could be either:

Which length description are you looking for?:

grandpa

'dad's dad' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in the Newsday and The Sun.

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