Crossword Genius

That one or this one (6)

Ross

I believe the answer is:

either

I believe this clue is a double definition.

'that one' is the first definition.
(thesaurus)

'this one' is the second definition.
(thesaurus)

(Other definitions for either that I've seen before include "Each of two; moreover" , "Word indicating the following alternatives" , "Her tie (anag.)" , "offered a choice" , "could be one of two" .)

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.