Cryptic crossword clue
Extraordinary growth in chess rating held by my mother 7

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

M
Y
E
L
O
M
A

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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 MYELOMA mean?

MYELOMA noun
  1. A malignant tumour arising from cells of the bone marrow, specifically plasma cells.

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