Answer:
small land in water.
I am always in front of you but you will never see me
I am a word. I become longer when the third letter is removed.
Where do fish keep their money?
I fly away as soon as you set me loose. People around you may slowly move away once they sense my presence.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.