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The uppercase register has this nice characteristic of allowing appends to them. However, every time I use them to yank a series of text, when it's time to paste them, I can see the old text from when I last used that same registry.
How can I clear them, prior to doing a series of yanks?
The uppercase registers and the lowercase ones are actually the same. When you yank using the lowercase version you replace the content of the register. When you yank using the uppercase version you append the content to the register.
Hence the standard answer is: Don't clear the register just use the lowercase version for the first yank.
Otherwise you can use the following call to set the register 'A' to empty string:
:let @a=''
Or, alternatively (from @romainl)
qaq
Which starts recording the macro of register a (qa) and immediately stop recording (q), leaving it empty.
But to clear the 'A' register such that the reg command don't list it (following @filbranden) you can:
:call setreg('a', [])
qaq would clear the a register
:call setreg('a', []) to actually clear the register itself (will no longer show in :reg output), rather than merely emptying it by setting it to an empty string.