Verify detail arranged by Virginia (8)
I believe the answer is:
validate
'verify' is the definition.
(thesaurus)
'detail arranged by virginia' is the wordplay.
'arranged' indicates anagramming the letters.
'by' is a charade indicator (letters next to each other).
'virginia' becomes 'va' (US state abbreviation).
'detail' anagrammed gives 'lidate'.
'lidate' after 'va' is 'VALIDATE'.
(Other definitions for validate that I've seen before include "stand by" , "Long poem" , "Confirm or authenticate" , "Certify or authenticate" , "Ratify" .)