I didn't know which process to look into so I looked into them all. I didn't see any dd. The word "clear" came from typing it in like you said so I could clear the AM.
There's a search field in AM's top right corner. You type in "dd" and see if you get an exact hit.
I never said anything about typing "clear" anywhere; you got that from somewhere on the web, and it's a totally wrong command.
Meanwhile, it sounds like control-C terminated the process for you.
Please copy & paste what you see in Terminal if you quit and relaunch it...BEFORE you enter any commands.
More: You still haven't edited your name out of post #54306.
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In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire