Answer: gatepost

AnswerCrossword Clue
GATEPOSTEntrance boundary, perhaps
GATEPOSTGarden entrance component, perhaps
GATEPOSTFiguratively, a keeper of secrets.
GATEPOSTImaginary third confidant.
GATEPOSTFence fixture
GATEPOSTFence part
gateposta post from which a gate is hung
gatepostA post on which a gate is hinged, or against which it shuts