The most common and most likely answer to this crossword clue is the 9 letter word MUSCOVITE
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More clues leading to the result MUSCOVITE
Buddy explains!

The straight part
We know that "from Russia" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case from russia = muscovite.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 MUSCOVITE mean?
MUSCOVITE noun- A pale brown mineral of the mica group, being a basic potassium aluminosilicate with the chemical formula KAl2(Si3Al)O10(OH,F)2; used as an electrical insulator etc.