"That's fair" (5)

I think it could be either:

Which length description are you looking for?:

valid

'that's fair' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for valid that I've seen before include "Well-grounded" , "Effectual" , "Legally acceptable and sound" , "Officially acceptable" , "Based on reason or law" .)

I've seen this clue in The New York Times.

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