Question

what is a adjective clause?

Answer 1

First, it will contain a subject and verb.
Next, it will begin with a relative pronoun [who, whom, whose, that, or which] or a relative adverb [when, where, or why].
Finally, it will function as an adjective, answering the questions What kind? How many? or Which one?

Answer 2

An adjective clause is simply a group of words with a subject and a verb that provide a description.