Crossword Genius

Change date after two consecutive letters (5)

Ross

I believe the answer is:

emend

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'change' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for emend that I've seen before include "change" , "Correct, revise (text)" , "Polish" , "would appear better" , "Improve (writing)" .)

I've seen this clue in The Guardian.
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