Crossword Genius

Fourth planet (4)

Ross

I believe the answer is:

mars

'fourth planet' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mars that I've seen before include "Ruins" , "part of suite" , "Roman war god; planet" , "world" , "one associated with war" .)

I've seen this clue in the Newsday.
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