Journey in South Africa (4)

I believe the answer is:

trek

I'm a little stuck... Click here to teach me more about this clue!

'journey' is the definition.
(I know that journey is a is a more specific form of the action of trek)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for trek that I've seen before include "Long hard journey on foot" , "A long hard march" , "Extended journey" , "Long walk in the mountains?" , "A long arduous march" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app