Crossword Genius

Like the planets Mercury, Venus, Earth and Mars (5)

Ross

I believe the answer is:

inner

(Other definitions for inner that I've seen before include "Concealed" , "Central area of a city, often old" , "Nearer the middle" , "This part of city is at the old centre" , "personal" .)

I've seen this clue in The New York Times.
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