The most common and most likely answer to this crossword clue is the 7 letter word CARPOOL
C
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Buddy explains!
The straight part
We know that "Group of travellers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case group of travellers = carpool.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 CARPOOL mean?
CARPOOL noun- An arrangement whereby several people travel together in the same car in order to save costs, reduce pollution etc.
- The group of people who participate in such a pool.
- To travel together in such a pool.