Cryptic crossword clue
Criminal using hideout, flipping anonymous 8

The most common and most likely answer to this crossword clue is the 8 letter word UNSIGNED

I've seen this crossword clue in Financial Times
U
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Buddy explains!

The straight part
We know that "anonymous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case anonymous = unsigned.
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 UNSIGNED mean?

UNSIGNED noun
  1. A numeric value or variable that has no sign and can only be positive.
UNSIGNED adjective
  1. Not accepting negative numbers; having only a positive absolute value.
  2. Lacking a signature, unendorsed.
  3. Not signed to an organization such as a sports club or record label.

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