If a clause is one subject, one verb; (SV.) and there is one clause in this sentence; then what part of speech is "monkeys"? It seems to me it would be another subject.
Mr. Potato Head eats monkeys.
- "Mr. Potato Head"
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The subject is the person or thing (Mr. Potato Head) performing the action (eats) and the direct object is the thing/person that the action is directed towards (receives the action = monkeys).
To find the direct object refer to the verb and ask what or who.
e.g. Mr. Potato head eats what? answer = he eats monkeys= direct object.
Also, your whole sentence is a clause because a clause contains a subject and verb.
The phrase, "Mr. Potato Head eats monkeys." contains subject, verb, object, in that order. This is typical of an English sentence in the active voice.
As also noted in comments, Mr. Potato Head is singular, which fits with the verb singuar conjugation of eats, whereas monkeys is plural. And in English you cannot write e.g. Mr. Potato Head eat monkeys., where monkeys is the subject and Mr. Potato Head is the object, nor can you write Monkeys eats Mr. Potato Head, with the subject after the verb (compared with German where you may normally write Mr. Potato Head isst Affen but could also write Affen isst Mr. Potato Head since the grammar rules do allow that).