I have solved most of it if anyone is interested. The ones I'm stuck on are: 11a. Water skiing board towed by a motorboat (9) a-u--l--- 15a.Large piece of ice detached from an iceberg (4) -a-f 15d. One of the sections into which a long poem may be divided(5) --n-o 9d Possession and use of one's own land or property (7) ---e--e