Read the sentence.

A tiny red bird in a tree outside my window chirped while I practiced my flute solo for the winter concert.

Which part of this sentence is a clause?

Basic sentence:

A tiny red bird in a tree outside my window chirped.

Clause:
,,,,, while I practiced my flute solo for the winter concert.

I practiced my flute solo for the winter concert. Could be a sentence all by itself. Therefore it is called an "independent" clause.

To identify the clause in a sentence, you need to look for a group of words that contains a subject and a predicate. In this sentence, the clause is "while I practiced my flute solo for the winter concert."

To break it down:
- The subject of the clause is "I."
- The predicate of the clause is "practiced my flute solo for the winter concert."

Therefore, the clause in this sentence is "while I practiced my flute solo for the winter concert."