The most common and most likely answer to this crossword clue is the 7 letter word STATIVE
S
T
A
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Buddy explains!
The straight part
We know that "Fixed in one of their camps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fixed in one of their camps = stative.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 STATIVE mean?
STATIVE noun- (grammar) A construct asserting that a subject has a particular property.
- (grammar) Asserting that a subject has a particular property.
- Of or relating to a fixed camp, or military posts or quarters.