Susan,
Yes (on both counts).
Plodding slowly on - I have done several more answers, some of which include a large amount of guesswork but which appear to be right even though I really don't know why. I'll set out a couple below for explanations, please. But I'll start with one requiring ahint, please:
8 down: Neater flowing in the delta was imminent (10)
Letters: I
think the first is P, the third is R and the seventh E.
2 down: Speed aboard steamer, cool long-distance vessel (9)
Letters were: S- A - E - H - P, so it has to be SPACESHIP, but why the 'speed aboard'? Vessel = SHIP
4 down: Set out and managed to puncture changing gear (7)
Letters were: A - R - N - E So ARRANGE, and I can see the anagrammed 'gear', but what has 'punture' got to do with it?!