Apprise, notify (6)
I believe the answer is:
inform
This clue is a double definition.
'apprise' is the first definition.
(I know that apprise is a more specific form of the action inform)
'notify' is the second definition.
(I know that notify is a more specific form of the action inform)
(Other definitions for inform that I've seen before include "Certify" , "Spill the beans" , "Provide facts - playing well" , "Pass on knowledge" , "'Apprise, notify (6)'" .)