Crossword Genius

Well-founded (5)

Ross

I believe the answer is:

valid

'well-founded' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for valid that I've seen before include "still in force" , "Reasonable" , "Legally in force" , "Sound, well-based" , "Effectual" .)

I've seen this clue in the Evening Standard and The Guardian.
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