The term 'drone, e.g.' refers to an unmanned aerial vehicle (UAV) or an unmanned aircraft system (UAS). The crossword solutions for this term are BEE (3 letters), MALE (4 letters), and BORE (4 letters). A drone is a type of UAV that is typically used for surveillance, reconnaissance, or military operations. The word 'bee' is often associated with drones because of their buzzing sound. The word 'MALE' is used to describe the gender of the drone, as it is typically unmanned. The word 'BORE' can refer to the drone's ability to BORE through the air, as it is able to fly without any human intervention.