This phrase signifies a specific type of clue found in crossword puzzles. It indicates the answer is a metal commonly used in machining processes. For example, a clue might be “Durable workshop metal (6)” with the answer being “STEEL.” This requires solvers to possess knowledge of both machining and metallurgy.
Such clues play a significant role in enriching crossword puzzles. They introduce elements of science and engineering, broadening the solver’s knowledge base beyond general vocabulary. Historically, crosswords have incorporated specialized terminology from various fields, reflecting the evolving interests and knowledge of the times. The inclusion of materials science terms like this reflects the ongoing importance of manufacturing and engineering in modern society.