Answer:
The part of the speech that the noun clause whoever scores the first goal performs in the sentence is an indirect object.
Step-by-step explanation:
While direct objects are nouns that receive the action of a verb, indirect objects are nouns that receive the direct object, and they follow the main verb. Plus, we can easily identify them by asking to/for whom or to/for what questions.
In the sentence, the direct object is a disc signed by Joel silver, and the indirect object is the noun clause whoever scores the first goal because this clause is receiving the direct object. Besides, it answers the to whom question "To whom will the coach give a disc signed by joel silver?" Answer: To whoever scores the first goal.