The most common and most likely answer to this crossword clue is the 7 letter word ANAGRAM
I've seen this crossword clue in Financial Times
A
N
A
G
R
A
M
More clues leading to the result ANAGRAM
- In German a grammar feature involving rearrangement
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Buddy explains!
The straight part
We know that "one" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one = anagram.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 ANAGRAM mean?
ANAGRAM noun- (of words) A word or phrase that is created by rearranging the letters of another word or phrase.
- To form anagrams.