8 across Duck for cover - the other way! (4) I have ?O?N and think the answer is DOWN but what has that to do with 'the other way'?
4 down ... and historical convention thus cut short (4) - ?R?D
2 down Now had to change, you'll agree? Very much so! (3,3) - ?N?H?W and I take it as an anagram of NOW HAD and get AND HOW - don't get it?