Warm yourself around soldiers (4)
I believe the answer is:
army
'soldiers' is the definition.
(group of soldiers)
'warm yourself around' is the wordplay.
'around' says the answer is hidden in the clue.
'ARMY' is hidden within 'warm yourself'.
(Other definitions for army that I've seen before include "Multitude" , "Fighting force" , "See 6" , "fighters" , "Organisation for soldiering" .)