Cryptic crossword clue
One who may discover her career’s ruined 10

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

I've seen this crossword clue in The Times
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The straight part
We know that "One who may discover" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one who may discover = researcher.
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 RESEARCHER mean?

RESEARCHER noun
  1. One who researches.

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