Crossword Genius

Unique, if intermittent, about English

Ross

I believe the answer is:

one-off

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(Other definitions for one-off that I've seen before include "Unique specimen" , "Not repeated or reproduced, a single thing" , "Made or done as a single thing, not repeated" , "Done a single time" , "Something unique" .)

I've seen this clue in The Guardian.
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