1) An old woman 2) An old woman or a Pontiac 3) Certain pontiac 4) In-betweener Pontiac model 5) Muscular Pontiac 6) Mustang competitor 7) Old lady 8) Pontiac car 9) Pontiac G6 predecessor 10) Pontiac model 11) Pontiac model once 12) Pontiac muscle car 13) Popular Pontiac of the past Found on https://www.crosswordclues.com/clue/grandam
Gran'dam noun [ French grande , fem. of grand + dame. See Grand , and Dame .] An old woman; specifically, a grandmother. Shak. Found on http://www.encyclo.co.uk/webster/G/50