Once again I am having trouble with the colossus cryptic!
1 Down. Alma Mater connections that are uniformly recognised. (3,6,4). I have - Old School *i*s.
71 Down. Tied up Heath and Edward briefly (6). I have ***red.
70 Across. What an adder is out to achieve (3). I have s**.
75 Across. Animal tore around to start with. I have **t*r.