Answer:

inform

AnswerCrossword Clue
INFORMTell
INFORMBreak the news to
INFORMTip off
INFORMNotify
INFORMDrop a dime
INFORMEnlighten
INFORMTattle
INFORMBring up to speed
INFORMApprise.
INFORMAdvice.
INFORMNotify.
INFORMKeep abreast
INFORMApprise
INFORMGive the facts
INFORMBe a rat