Not so good this week. Maybe I have some wrong clues. Anyway help please on the following: 10d What's Latin for "starting point"? A rum question as it turns out (8,1,3) T?R?I?U? A ?U?. 29a Small amount of drug, very tiny shot (8) ?I?R?D??. 41a Writer accompanies Prime Minister round his city. (7) M?M???S. 52d Sign up and vote Communist (4) ?A??. Much appreciated