Now that you agree my 13d! has anyone got 6a plant with tall straight flowering stem -a-o-s-o-,or 36a a member of a tropical genus of gastropods T-t-o, 39a Relating to greek poet of around 600BC ?
36 across is Turbo. Any one of numerous marine gastropods of the genus Turbo or family Turbinidæ, usually having a turbinate shell, pearly on the inside, and a calcareous operculum. I'm also stuck with 6a.