### Clue: Musical instrument on floor in Habitat (4-3)
### Answer: REED-BED 
 ### Explanation: Definition: Habitat
 REED(any of the musical wind instruments with a thin piece of cane or metal inserted into its tube) **placed above**(on, in a down clue) BED(a floor, as in the sea-bed).
Defn: A natural habitat found in wetlands, composed of, well, reeds, and supporting an ecosystem.