Read the sentence.

Question

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?

Answer 1

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.