Cryptic crossword clue
King George with his mother and her mother 7

The most common and most likely answer to this crossword clue is the 7 letter word GRANDMA

I've seen this crossword clue in The Guardian
G
R
A
N
D
M
A


Buddy explains!

The straight part
We know that "her mother" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case her mother = grandma.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does GRANDMA mean?

GRANDMA noun
  1. Grandmother

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