Filming celebrity in 'The Meteor (8,4)
I believe the answer is:
shooting star
''the meteor' is the definition.
(synonyms)
'filming celebrity' is the wordplay.
'filming' becomes 'shooting' ('shoot' can be a synonym of 'film').
'celebrity' becomes 'star' (a star is a celebrity or famous person).
'shooting'+'star'='SHOOTING STAR'
'in' acts as a link.
(Other definitions for shooting star that I've seen before include "Annie Oakley, for example" , "One making meteoric progress" , "on which you'd make a wish?" , "Top toxophilite" , "like a rocket?" .)