What does the cryptic crossword clue "Order as purist on another level? (8)" mean?

The definition is "level?". The wordplay uses an anagram. anagram of ASPURIST ("as purist") [anagram: "another"] = UPSTAIRS The answer is Upstairs.

Order as purist on another level? (8)

Telegraph Prize Cryptic #3059 | 9 Across | 2020-06-07 flower