Crossword Genius

It's not mentioned that hearty aunts get like granny (6)

Ross

I believe the answer is:

untold

I'm a little stuck... Click here to teach me more about this clue!

'hearty aunts get like granny' is the definition.
I can't tell whether this defines the answer.

'it's not mentioned' is the wordplay.
'it's not' becomes 'un' (prefix meaning 'not').
'mentioned' becomes 'told' (I can't justify this - if you can you should believe this answer much more).
'un'+'told'='UNTOLD'

'that' acts as a link.

Can you help me to learn more?

(Other definitions for untold that I've seen before include "Not narrated or measured" , "Too many to be counted; not narrated" , "Story yet to be read" , "like a kept secret?" , "Incalculable amount" .)

I've seen this clue in the Evening Standard.
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