In the following sentence am I correct to say that "whom the newspaper endorsed" is the adjective clause.

My company once employed the woman whom the newspaper endorsed for political office.

Yes. However, "for political office" is also part of this clause.

"whom the newspaper endorsed for political office" <~~yes, that's the whole adjective clause, modifying "woman"

Yes, you are correct in identifying "whom the newspaper endorsed" as an adjective clause in the given sentence. An adjective clause is a dependent clause that functions as an adjective by modifying a noun or pronoun. In this case, "whom the newspaper endorsed" modifies the noun "woman." It provides additional information about the woman, specifying that she is the one endorsed by the newspaper for political office.

To identify an adjective clause, you can follow these steps:

1. Look for a dependent clause that starts with a relative pronoun (e.g., who, whom, whose, which, that).
2. Determine if the clause is modifying a noun or pronoun in the sentence.
3. If the clause is modifying a noun or pronoun, you have identified an adjective clause.