Cryptic crossword clue
I hew select ground — having to extract tungsten form this? 9

The most common and most likely answer to this crossword clue is the 9 letter word SCHEELITE

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The straight part
We know that "this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this = scheelite.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does SCHEELITE mean?

SCHEELITE noun
  1. A mineral composed of calcium tungstate, with the chemical formula CaWO4; an important tungsten ore.

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