"The answer to "Is clear a color?" depends on how one is defining color. People commonly refer to color with two different meanings: Light color and pigment color. The primary colors of light are red, green, and blue. These are the colors that can make all other colors, by adding them together. Red+green=yellow, red+blue=magenta, green+blue=cyan. If red, green, and blue light are all mixed, we get white light. If we take away all the light, we have black (dark).
The primary colors of pigments, on the other hand, are magenta, cyan, and yellow. (As children, most of us learned these as red, blue, and yellow, but this is not exactly right. However, red, blue, and yellow are close enough approximations when we mix poster paints.) The objects we see are all colored with pigments. The reason they appear a particular color is because that pigment is capable of absorbing some COLORS OF LIGHT and reflecting others. For example, a red shirt appears red because it absorbs all LIGHT COLORS except red. Red is reflected, so we see the shirt as red. So for OPAQUE objects, the color that is REFLECTED is the color that we see. The colors that are absorbed, we do not see. A white shirt, then, reflects all colors of light, while a black shirt absorbs all colors. (This is why we don't like to wear black on a hot summer day. Absorbed light is converted to heat.)
The situation changes slightly when we are dealing with transparent objects, such as colored (or clear) glass. Transparent objects absorb some wavelengths of light, while they TRANSMIT others. It is the transmitted colors that we see. For example, blue glass transmits BLUE LIGHT and absorbs the other colors.
So how does 'clear' fit in? For opaque objects, when all colors are reflected, we get white. For transparent objects, when all colors are transmitted, we get clear. So if one follows this line a reasoning, clear is the transparent equivalent of white. Clear is acually the transmission of all wavelengths--colors, that is--of light. So if you consider 'white' a color, then you ought to consider 'clear' a color.
(Many scientists, and others, will tell you that white is technically not a color, since it is the combination of all other colors. So we come back to semantics--it's all in how you define 'color.')
I'm fairly confident in this answer, but I wouldn't put my life on it in a hostage situation...."