Journey, often following star (4)

I believe the answer is:

trek

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'journey' is the definition.
(trek is a kind of journey)

I can't explain the rest of the clue.

(Other definitions for trek that I've seen before include "Difficult journey on foot" , "Long difficult walk" , "A long arduous walk" , "Expedition or difficult trip" , "Long walk in the mountains?" .)

I've seen this clue in The Mirror.

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