Crossword Genius

Anti- or auto-, for example (6)

Ross

I believe the answer is:

prefix

(Other definitions for prefix that I've seen before include "initial qualifier" , "Addition to the start of a word" , "Eg, pre-, inter-" , "Something like ex- or non-" , "Something added to the start of a word - title before a name" .)

I've seen this clue in The Guardian.
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