The most common and most likely answer to this crossword clue is the 6 letter word AUREUS
I've seen this crossword clue in Financial Times
A
U
R
E
U
S
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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 AUREUS mean?
AUREUS noun- A gold coin, minted in the Roman Empire from approximately 100 B.C.E. to 309 C.E., equal to 25 denarii.