The term 'long-distance caller' can be summarized as someone who makes phone calls over a long distance. This could refer to someone who is calling from one country to another, or from one state to another. The crossword solution for this term is 'Tarzan, ' which is the name of a fictional character created by Edgar Rice Burroughs in 1912. Tarzan is known for his ability to communicate with animals and his strength and agility, which he uses to traverse long distances.