IPA: /ˈklætərər/
KK: /ˈklætərər/
A person or thing that makes a loud, rattling noise, often by striking or banging together.
The clatterer in the kitchen made it hard to hear the conversation at the table.
Clatterer is formed from "clatter" (of imitative origin, representing the sound of clattering) and "-er" (meaning a person who). The word describes a person who makes a clattering noise or is noisy.
Think of someone who makes a loud, clattering sound — that's what a clatterer does.