What does the cryptic crossword clue "Reason one upset with a trial (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Reason one upset with a trial (9)

Telegraph Prize Cryptic #3186 | 19 Across | 2022-11-13 flower

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