Free of typos, say

EMEND

Think of what an editor does to correct errors in a manuscript before publication. It starts with an "E" and rhymes with "amend."

"Free of typos, say" hints at correcting errors in text, which is what "emend" means—to fix mistakes in writing. The word "say" signals this is just one example of how something might be error-free, not a literal instruction. It’s a straightforward definition clue with no hidden wordplay, relying on the solver’s vocabulary.