1: Sounds like a bright child (3).
2: He wrote a bit of poetry! (3)
3: Somehow it is clear and practical (9)
4: Path of planet - or particle (5)
5: It might reside in monument! (5)
8: Born and raised, it is whispered, to make money (5)
9: Preliminary form of conscription (5)
11: Famous gardens said to move one to speak. (3)
12: Mann's 'Death in Venice' Dorothy sent up (3)