What does the cryptic crossword clue "Large-scale course briefly a focus for seismologist (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.

Large-scale course briefly a focus for seismologist (9)

Guardian Cryptic #28354 | 11 Across | 2021-01-28 flower

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