To find Clara without Triggering the Alarm in The Lion’s Den in Far Cry 6, make your way around the north part of Castillo’s Mansion staying away from any enemies. Make your way to a tower on the north west side of the mansion and climb it.
Wait for enemies to be away from the zipline and take it over to the roof of Castillo’s Mansion. Go along the roof until you are above the objective maker and wait for the patrolling enemy to be below you. Drop down, take out the enemy and enter the door to find Clara.