Stuck on last couple - 7a and 7d. After drink feature long discussion (5-2). Have ??A?H?N and Axing unorthodox atom scientist (11) ????H?W?I?G is it ????HAWKING? Thx in advance.
Yes Teach-In.
Tea (drink) + chin (feature)
It must mean 'long discussion' but I've never heard of it. I remember the Eurovision winners called Teach In, though (Ding a Dong!)