Hmmmm . . .

Every week, I will give you a riddle or two. See if you can work it out. It is the Saturday the 5th. I will announce the answer on Saturday the 12th. See if you can ge it before I give you the answer. Click read more to see it on proper format.

My first is in fish but not in snail,
My second is in rabbit but not in tail.
My third is in up but not in down,
My fourth is in tiara but not in crown.
My fifth is in tree you plainly see,
My whole a food for you and me.
What am I?