Such a star must be making a film (8)
I believe the answer is:
shooting
I believe this is a double definition.
'such a star' is the first definition.
(thesaurus)
'making a film' is the second definition.
(I've seen this before)
'must be' acts as a link.
(Other definitions for shooting that I've seen before include "- Jacket; - star" , "Dashing" , "Producing growth" , "on target" , "gun crime" .)