Authority, for example? (3)
I believe the answer is:
say
I believe this is a double definition.
'authority' is the first definition.
(I've seen this in other clues)
'for example?' is the second definition.
(Other definitions for say that I've seen before include "Express in words" , "Articulate" , "by way of example" , "Utter words" , "Tell" .)