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Metal
producers
manufactured
steel
frames
occasionally
(8)
Metal producers manufactured steel frames occasionally (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Metal producers — people who melt ore to extract metal. "Manufactured" is your anagram indicator, and the fodder comes from steel combined with the alternate (even-positioned) letters of frames, giving you R, M, S. Jumble STEELRMS together and you get your answer.