Crossword Genius

Prefix meaning "first" (5)

Ross

I believe the answer is:

proto

'prefix meaning first' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for proto that I've seen before include "Prefix indicating the first, earliest or original" , "Denotes the first or earliest" .)

I've seen this clue in the Newsday.
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