Beer taken round a camp (6)
I believe the answer is:
laager
'camp' is the definition.
(laager is a kind of camp)
'beer taken round a' is the wordplay.
'beer' becomes 'lager' (lager is a kind of beer).
'taken round' indicates putting letters inside.
'lager' going around 'a' is 'LAAGER'.
(Other definitions for laager that I've seen before include "Entrenched position" , "South African enclosure" , "Wagon camp in a ring" .)