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

The straight part
We know that "pure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pure = distilled.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 DISTILLED mean?
DISTILLED verb- To subject to distillation.
- To undergo or be produced by distillation.
- To make by means of distillation, especially whisky.
- To exude in small drops.
- To impart in small quantities.
- To extract the essence of; concentrate; purify.
- To trickle down or fall in small drops; ooze out.
- To be manifested gently or gradually.
- To drip or be wet with.
- To subject a substance to distillation.
- To undergo or be produced by distillation.
- To make by means of distillation, especially whisky.
- To exude in small drops.
- To impart in small quantities.
- To extract the essence of; concentrate; purify.
- To trickle down or fall in small drops; ooze out.
- To be manifested gently or gradually.
- To drip or be wet with.