Yes, "clang" is a real word. It refers to a loud, ringing sound, such as that made by metal objects striking together.
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The sound of the hammer hitting the metal produced a loud clang.
I heard the loud clang of metal hitting the ground.
I use clang for compiling C and C++ code on my computer.
Clang is a compiler front end for the C, C++, and Objective-C programming languages.
The correct term is onomatopoeia, which refers to words that imitate the sound they represent. Examples include "buzz" and "clang."