I originally titled a column CLEAR, but later I opted for CLR instead. On a Check Register program, I have a column to clear my entries where on each line I enter CLR. But every time I enter the letter C, the original word CLEAR auto-fills the cell. How can I change it to CLR?
Thanks in advance. You all are great! 
See the help file: AutoInput.
If you still want the AutoInput: since it scans the column, to remove the CLEAR string from the feature proposals, you have to remove all of the entries. Use Find & Replace. Once there is no more CLEAR entry in the column, typing cl should proposed CLR.
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Or just continue typing until you have CLR. AutoInput will keep suggesting CLEAR also for CL but not for CLR.