The most common and most likely answer to this crossword clue is the 9 letter word MONETISED
I've seen this crossword clue in The Guardian
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More clues leading to the result MONETISED
Buddy explains!

The straight part
We know that "turned into currency" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case turned into currency = monetised.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 MONETISED mean?
MONETISED verb- To convert something (especially a security) into currency.
- To mint money.
- To establish a currency as legal tender.
- To make a business activity profit-generating, particularly in computer and Internet-related activities.