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Sort of aunt, nana and daughter? (5)

Ross

I believe the answer is:

grand

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'sort of aunt' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'nana and daughter?' is the wordplay.
'nana' becomes 'gran' (I've seen this in another clue).
'and' says to put letters next to each other.
'daughter?' becomes 'd' (genealogical abbreviation).
'gran'+'d'='GRAND'

Can you help me to learn more?

(Other definitions for grand that I've seen before include "Splendid - piano" , "1000, colloquially" , "Fine" , "Magnificent, imposing" , "Exalted, magnificent" .)

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