JM Cryptic Crossword 51
Across
1. A knight initially followed a confused ape to the top. (4)
3. The begining of a plant in these educated people. (4)
6. The trajectory of a satellite. (5)
8. A maths problem in the summer homework ? (3) 
10. Adjust in closet. (3)
12. Opt out of a vessel. (3)
14. The nearest star. (3)
16. An occasion in the vent. (5)
17. A temporary dwelling. (4)
18. A sign from no men. (4)
Down
1. A way from one valley to another. (4)
2. Mota broken up to get the basic unit of matter. (4)
4. Consumes a broken seat. (4)
5. The notch at the junction after the lions home. (4)
7. A courageous Indian ? (5)
9. Initially a world body. (3)
11. A large bird in the Mudumalai Sanctury ? (3)
12. Trousers that get you out of breath ? (4)
13. A little bird sounds like changing directions. (4)
14. Stop the stalk ! (4)
15. Midday. (4)