Oxford dictionary defines clinical as: "very efficient and without feeling; coldly detached".
This is the trader's attitude, trading without feelings, without emotions.
Markets are moved by sentiment that is reflected in price action. The idea is to avoid participating on the sentiment part but being able to buy and sell equities and other instruments managing our risk in a way we can beat the market.
The purpose of this site is to help you getting the basic knowledge to manage your risk accordingly before buying or selling assets.