Crossword clues for One who's next in line 4 letters:HEIROne next in lineHEIROne who's next in linePROTEMPresident ___ (one next in line after the VP)SONNext one in line, usuallyHEIRAPPARENTOne next in line for the throneENJAMBMENTFlow of one line of a verse to the next without pause