single or unique crossword clue

 Sure, here are some possible crossword clues for "single" or "unique":

One of a kind

Unmatched

Unparalleled

Peerless

Unrivaled

Singular

Distinctive

Special

Exceptional

Rare

Uncommon

The specific clue that is used will depend on the context of the puzzle and the other words in the puzzle. For example, if the clue is "something that is only one of its kind", then the answer is likely to be "one of a kind". However, if the clue is "something that is very special or unusual", then the answer is likely to be "unique".

I hope this helps!