'Inculpate' is found in certain dictionaries (6)
I believe the answer is:
indict
'inculpate' is the definition.
(thesaurus)
'found in certain dictionaries' is the wordplay.
'found in' indicates a hidden word.
'INDICT' is hidden in the letters of 'certain dictionaries'.
'is' is the link.
(Other definitions for indict that I've seen before include "Make written statement of charge or accusation" , "Charge (someone) with serious crime" , "Make accusation of wrongdoing" , "Accuse, prosecute" , "Make accusation or charge against an accused" .)