What does the cryptic crossword clue "Pronounced seam of mineral becomes worthless (4)" 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.

Pronounced seam of mineral becomes worthless (4)

Guardian Cryptic #24485 | 2 Down | 2008-09-04

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