Camp out (7)
I believe the answer is:
bivouac
'camp out' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for bivouac that I've seen before include "Temporary and basic encampment" , "Temporary camp for soldiers" , "Temporary camp without tents or cover" , "Pass the night in the open air" , "A temporary army camp" .)