1) Bartender 2) Boarding school biggie 3) Head 4) Head teacher 5) Master 6) Prep-school VIP 7) Presiding officer of a school 8) Principal 9) Private school principal 10) School principal 11) Schoolmaster 12) Senior teacher Found on https://www.crosswordclues.com/clue/headmaster
[Transformers] Headmasters are a sub-group of characters from the Transformers meta-series, distinguished by their ability to detach their heads when transforming into their alternate modes, with the heads then transforming themselves into a humanoid form. However, this concept was taken in several different directions across the different ... Found on http://en.wikipedia.org/wiki/Headmaster_(Transformers)