DOORKEEPEROnrecordSet once, to “Guard” — The New York Times, Wednesday, 7 January 2004.10 lettersOther answers to these cluesDEFEND6 lettersDEFENDER8 lettersENSURE6 lettersGATEMAN7 lettersOLD3 lettersPATROL6 lettersSENTINEL8 lettersSENTRY6 lettersSHIELD6 lettersTEND4 letters