What does the cryptic crossword clue "Slicer: one formed marks on board (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.

Slicer: one formed marks on board (9)

Telegraph Prize Cryptic #3150 | 28 Across | 2022-03-06 flower

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