Thanks, bunty. Not overly convinced, but it might just be a bad clue. I think I'll look at the "cheat" on the Guardian site to see if it's the right answer.
I have an idea for 4b but I can't justify it. I will write it below backwards to prevent spoiling it for others. any ideas why this might be the answer?
That's from Saturday's. I put that in too. The definition is OK and it fits, so I didn't worry any further about it - too many others to do at the time!