The most common and most likely answer to this crossword clue is the 5 letter word NOMAD
I've seen this crossword clue in The Times
N
O
M
A
D
More clues leading to the result NOMAD
- Rover has no crackers
- Wayfarer with small number on loco
- Traveller of sound mind in Glasgow?
- No bananas for homeless person
- Not one check over migrant
- Vagrant originally moving around in biblical land
- No bananas for wanderer
- Number furious to see traveller
- Wanderer Pythias's friend recalled
- Fellow reversing around old lady in Rover
Buddy explains!

The straight part
We know that "traveller" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case traveller = nomad.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 NOMAD mean?
NOMAD noun- A member of a society or class who herd animals from pasture to pasture with no fixed home.
- A person who changes residence frequently.
- A player who changes teams frequently.
- Of or relating to nomads, whether
- One who wanders, who travels aimlessly.
- Any of various far-migrating nymphalid butterflies of the genus Danaus.
- The wandering albatross, Diomedea exulans.