Answer: preaching

AnswerCrossword Clue
PREACHINGBible-thumping, perhaps
preachingPublicly proclaim or teach (a religious message or belief)
preachingPREACH, to deliver a sermon
preachingEarnestly advocate (a belief or course of action)
preachingDeliver a sermon or religious address to an assembled group of people, typically in church
preachingGive moral advice to someone in an annoying or pompously self-righteous way