The most common and most likely answer to this crossword clue is the 8 letter word PILGRIMS
I've seen this crossword clue in The Guardian
P
I
L
G
R
I
M
S
More clues leading to the result PILGRIMS
Buddy explains!

The straight part
We know that "travellers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case travellers = pilgrims.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 PILGRIMS mean?
PILGRIMS noun- One who travels, especially on a journey to visit sites of religious significance.
- A newcomer.
- A silk screen formerly attached to the back of a woman's bonnet to protect the neck.