Stuck with two.
1a Leaders missing the alarm we all have about radioactive material (6) UR?N?C ( Must be URANIC but why?)
28a Indan workers in one African country head for Angola S?D?AS
Thanks vetuste_ennemi. Where did you get the name? And thanks to you too, bibblebub. (The pedant in me squirms at the use of lower case letters for proper nouns. Miss Butler from primary 7 would have had a ruler over my knuckles if she were still alive.) These clues are getting more and more layered these days or is it just my old age?