Answer:
My first is a body of water. My second is me. My third came before. My fourth before all three. My fifth sounds like my first. My sixth is in a lake. Put all six together to make an animal that will keep you awake.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
What can you catch but not throw?
The sharp slim blade, that cuts the wind.
Just head and foot yet never tires of dancing.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?