Cryptic crossword clue
One comes across wild folk invading territory 9

The most common and most likely answer to this crossword clue is the 9 letter word TRAVERSER

I've seen this crossword clue in Financial Times
T
R
A
V
E
R
S
E
R

Buddy explains!

The straight part
We know that "One comes across" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one comes across = traverser.
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 TRAVERSER mean?

TRAVERSER noun
  1. One who, or that which, traverses or moves, such as an index on a scale.
  2. One who traverses, or denies.
  3. A traverse table.

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