Hosts premiere of movie surrounded by stars (6)
I believe the answer is:
armies
'hosts' is the definition.
(I've seen this before)
'premiere of movie surrounded by stars' is the wordplay.
'premiere of' says to take the initial letters.
'surrounded by' indicates putting letters inside.
'stars' becomes 'Aries' (constellation).
The first letter of 'movie' is 'm'.
'm' put within 'aries' is 'ARMIES'.
(Other definitions for armies that I've seen before include "Large groups of soldiers" , "Organizations of military land forces" , "Hosts" , "Multitudes" , "Fighting forces" .)