Way to clear line without removing the line?

I am guessing this should be a real simple question but cant find an answer readily:

If I want to remove all contents of a line, I press 'd' twice. But in most cases I want the line to still be there (meaning the space, so after deleting I would have a blank line), so I tend to find myself when deleting afterward replacing the line (like shift + O).

So if I am making any sense, is there a way to remove all contents of a line without removing the line itself (I guess similarly to using x to delete a character but for a whole line)?

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