Cryptic crossword clue
You end up including everything pure 9

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

I've seen this crossword clue in Financial Times
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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 = unalloyed.
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.

Crossword Answer definitions

UNALLOYED adjective
  1. (of metal) Not alloyed; not in mixture with other metals; pure.
  2. Complete and unreserved; pure; unadulterated; not restricted, modified, or qualified by reservations.

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