Cryptic crossword clue
Maiden upset with gut size 9

The most common and most likely answer to this crossword clue is the 9 letter word MAGNITUDE

I've seen this crossword clue in Independent
M
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The straight part
We know that "size" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case size = magnitude.
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 MAGNITUDE mean?

MAGNITUDE noun
  1. The absolute or relative size, extent or importance of something.
  2. An order of magnitude.
  3. A number, assigned to something, such that it may be compared to others numerically
  4. Of a vector, the norm, most commonly, the two-norm.
  5. A logarithmic scale of brightness defined so that a difference of 5 magnitudes is a factor of 100.
  6. A measure of the energy released by an earthquake (e.g. on the Richter scale).

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