Possible Clues:

• One calls for item hidden in mask
• Person making call to protect it with face-saving device
• One might come to stay with it in what's over the eyes
• One dropping by
• Caller, guest
• When calling, one may have rung the bell
• One who calls round for it in a flap
• Drop-in
• That's come to stay
• It is to be found calling in what goes over the eyes