Cryptic crossword clue
One girl, May, works in a branch of earth sciences 10

The most common and most likely answer to this crossword clue is the 10 letter word MINERALOGY

I've seen this crossword clue in The Daily Telegraph
M
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Buddy explains!

The straight part
We know that "branch of earth sciences" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case branch of earth sciences = mineralogy.
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 MINERALOGY mean?

MINERALOGY noun
  1. The branch of petrology that studies minerals.
  2. Its mineral materials.
  3. A treatise on mineralogy.

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