The most common and most likely answer to this crossword clue is the 6 letter word ANONYM
I've seen this crossword clue in The Guardian
A
N
O
N
Y
M
More clues leading to the result ANONYM
- Soon, Gordon Bennett will return as an alias
- One not identified turned up in academy — no name
- Soon switched my name, such as Brendan
- Crummy no-name covering up one such?
- Fictitious name soon to get Screw’s backing
- One’s name’s withheld
- Bird from the East concealing no alias
- Maiden gone, bloke on my back gives fictitious name
- Shortly the setter’s retiring – one won’t reveal his identity
- Soon, your setter’s turning up as ‘Giovanni’?
Buddy explains!
The straight part
We know that "Fictitious name" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fictitious name = anonym.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 ANONYM mean?
ANONYM noun- An anonymous person.
- An assumed or false name; a pseudonym.
- A mere name; a name resting upon no diagnosis or other recognized basis.