The term 'OBSOLESCENT Summoner' can be broken down into two words, 'OBSOLESCENT' and 'Summoner'. OBSOLESCENT is an adjective meaning out of date or no longer in use, while a summoner is someone who calls people to appear in court. The crossword solution for this term is 'BEEPER', which is a device that emits a sound or signal as a form of communication. Beepers are now considered obsolete due to the prevalence of cell phones and other modern communication devices.