What type of clause is shown in parentheses Whomever you are calling probably bed?

The clause in parentheses "(Whomever you are calling)" is a noun clause.

Here's why:

* It functions as the object of the verb "probably." The sentence essentially says, "You are probably bedding whomever you are calling."

* It is a complete thought: It has a subject ("whomever") and a verb ("are calling").

* It answers the question "who?" The clause is essentially acting as a pronoun, substituting for the person being called.

Let me know if you'd like more examples of noun clauses!