Wide-ranging terror grips soldiers by unwalled camp (9)
I believe the answer is:
panoramic
'wide' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for panoramic that I've seen before include "not restricted" , "Extensive" , "All-embracing" , "all around" , "giving full view" .)