Crossword Genius

Errors when texting certain blood donors, we hear (5)

Ross

I believe the answer is:

typos

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'errors' is the definition.
(typo is a kind of error)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for typos that I've seen before include "Mistakes" , "Printing errors" .)

I've seen this clue in The Telegraph.
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