Finish being a traveller (6)
I believe the answer is:
arrive
'finish' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how they can define each other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for arrive that I've seen before include "Reach intended destination" , "Reach goal" , "Reach destination or desired position" , "Turn up" , "To gain recognition" .)