Army entertainer (4)
I believe the answer is:
I believe this clue is a double definition.
'army' is the first definition.
(host is a kind of army)
'entertainer' is the second definition.
(host is a kind of entertainer)
(Other definitions for host that I've seen before include "One receiving guests" , "A load" , "Compere; multitude" , "Does he invite a large number?" , "Compre" .)