What unsuccessful Tinder users do is unique (9)

I believe the answer is:

matchless

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'unique' is the definition.
(without match or equal)

I don't understand the remainder of the clue.

(Other definitions for matchless that I've seen before include "team without a fixture" , "Unequalled" , "unlike Andersen's poor little girl?" , "Without a rival" , "Like the top" .)

I've seen this clue in The Daily Express.

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