Crossword Genius

Space traveller, tailed (5)

Ross

I believe the answer is:

comet

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'space traveller' is the definition.
(object travelling through space)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for comet that I've seen before include "Tailed heavenly body" , "high-flier" , "Small extraterrestrial body" , "Line of rotation" , "traveller covering huge mileage" .)

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