Crossword Genius

First in the world! (6)

Ross

I believe the answer is:

eldest

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'first' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

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(Other definitions for eldest that I've seen before include "Most old" , "Most advanced in years" , "Most senior of two" , "Most advanced in age, led set (anag.)" , "Most aged" .)

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