all answers either have somthing to do with eggs , have egg or sound like eg in the answer
2 look in the dross(5)
4 top class, very select(4)
10 a falcon or a pilgrim(9)
15 for building fairy tale castles, or robots (4)
16 this sounds like a thoughtful one and costs a lot (9)
17 found with tortoise and fish (5)