What does the cryptic crossword clue "Millstone roughing up brass a lot (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.

Millstone roughing up brass a lot (9)

Telegraph Prize Cryptic #3292 | 6 Down | 2024-11-24 flower

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