Help to get started please@-
1a. Sunlock occasions? (2 words) (13)
16a. Grey interior and borders, say (4)
18a. Talk about pretidigitator's third trick (5)
21. Starter of course like hot bread (4)
27a. A rich nude sort always a failure (13)
.... again I think solar is the better answer as a "total" eclipse doesn't necessarily after to be regarding blocking the sun. However "total" could be correct also.