Lincoln Cents aren't made with clad. They made with copper plated zinc. The copper plating was worn off from circulation. It's not an error. The copper plating could of been chemically stripped off or it could be a Texas Cent, if it's larger in size.
For one thing, the weight is not very light, a 1994 cent should weigh approximately 2.5g, just like yours. Also the "silver" you are seeing is probably the zinc core showing through in areas where the copper has worn down.
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