Data-entry goof (4)
I believe the answer is:
typo
'data-entry goof' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for typo that I've seen before include "Printing error (colloq.)" , "Keyboard slip-up" , "Character flaw" , "Printer's mistake" , "Mistake in printed matter, in short" .)