The most common and most likely answer to this crossword clue is the 4 letter word TREK
I've seen this crossword clue in Financial Times
T
R
E
K
More clues leading to the result TREK
- …long walk to reach Eastern Kinross, initially
- Arduous march leaders of the Royal Engineers finally undertook
- Tramp is some hiker travelling westward
- Journey back in seconds from ski resort’s train station
- Hike starts in The Rip and ends in the outback
- What’s walker, tired, recalled? Some of it anyway
- Hiker turned back during long walk . . . .
- Leaders of this rove east to west of Kenya?
- Long journey ends in disappointment for the monk
- Tramp starts to trudge round eastern Kalahari
Buddy explains!

The straight part
We know that "Tramp" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tramp = trek.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TREK mean?
TREK noun- A journey by ox wagon.
- The Boer migration of 1835-1837.
- A slow or difficult journey.
- A long walk.
- To make a slow or arduous journey.
- To journey on foot, especially to hike through mountainous areas.
- To travel by ox wagon.