nutmeg or allspice.
flour
No, milk is thicker than water it will dry out the biscuits. Yes, but you would have to add in some other form of fat like butter, margarine, or shortening.
not really because they'd turn out like muffins
Most biscuits use baking powder or baking soda in baking. Biscuits are a type of quick bread. Though some cooks do use some yeast to make their biscuits rise more.
Yes, if the recipe calls for mayonnaise. This brand of salad dressing is made almost exactly the same as mayonnaise.
cloves
You will get a much different finished product. Since oil is a liquid and butter isn't, cut the amount in half and some sort of cookie will result. For something like a sugar cookie, it would not work. For a cake like cookie, it probably will. I use oil instead of shortening in biscuits and that seems to work. You just have to experiment.
to make a cheesecake you will need to use about 8 digestive biscuits (you can use more than 8 if you want)
If one teaspoon of whole cloves is approximately equivalent to 0.75 teaspoons of ground cloves, then 0.50 teaspoons of whole cloves is equivalent to 0.375 teaspoons of ground cloves. If you do not have ground cloves, then a substitute to use is ground allspice.
Some people with diabetes, or risk of diabetes, use cloves because they are said to help balance blood-sugar levels. Cloves are not used for general weight-loss.
small children
Good heavens, NO! Cloves and garlic do not resemble each other in flavor any more than chocolate and horseradish do. You would NEVER substitute one for the other. They are two of the most distinctive - and different - flavors in cooking. A clover of garlic is one section of the garlic head. Cloves, as a spice, look like tiny nails. They have one of the most pungent and pervasive flavors of any spice, and must be used with great discretion.