Crossword Genius

Well-founded (5)

Ross

I believe the answer is:

valid

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">well-founded</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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