Crossword Genius

Some medieval ideas are well-founded (5)


I believe the answer is:


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

'some medieval ideas are' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'VALID' is hidden within 'medieval ideas are'.

(Other definitions for valid that I've seen before include "Legally acceptable, unexpired" , "Still legally acceptable" , "Based on reason or law" , "Sound, well-based" , "Officially acceptable" .)

I've seen this clue in the Sydney Morning Herald.
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