Crossword Genius

Means of securing important raw material (6)

Ross

I believe the answer is:

staple

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'raw material' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for staple that I've seen before include "Main, important" , "security device" , "Clip" , "office item" , "Paper-fastening device" .)

I've seen this clue in The Independent.
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