Crossword Genius

Unmarried parent is not the same (5)

Ross

I believe the answer is:

other

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'not the same' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for other that I've seen before include "One may be significant" , "Throe (anag)" , "Different; alternate" , "Different; additional" , "else!" .)

I've seen this clue in The Guardian.
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