Certified (10)
'certified' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for validated that I've seen before include "proved true" , "backed up" , "certified" .)
'certified' is the definition.
(accrediting is a kind of certifying)
This is all the clue.
(Other definitions for accredited that I've seen before include "Broadcast" , "Certified officially" , "Given official recognition" , "Given official authorisation" .)