To make up sections in a chain;
It may come before a drain.
You're on the edge or almost there;
A ferret with the pricey hair.
Desire that is never bland;
A place for blades, but not in hand.
To give a signal with an eye;
Azaria as "science guy".
The sound of very uncooked ham;
The reason that I know I am.
What am I?