In case of independent clause , I am having difficulty in understanding a sentence. About clauses what I know is: Definition: They are groups of words that contain a subject and a verb or they are used to add more detail to the noun in a sentence.
Example: The fast, red squirrel darted up a tree. The subject , noun of this clause is the fast, red squirrel, and the verb is 'darted'.

Now , back to independent clauses , An independent clause is a clause that can stand on its own as a distinct sentence. Example: I love eating cookies.

The sentences I am having trouble with is this one: His truck is green.

Here , the truck is the subject or noun. But there is no verb. Shouldn’t we say that this is not a clause ?