Filming Ghost in Barking, Whoopie's heart stops! (8)
I believe the answer is:
shooting
'filming' is the definition.
('shoot' can be a synonym of 'film')
'ghost in barking whoopie's heart stops' is the wordplay.
'barking' indicates an anagram ('barking' can informally mean mad).
'heart' says to take the centre.
'stops' is an insertion indicator (to stop can mean to block a gap).
The central letter of 'whoopie' is 'o'.
'ghost'+'in'='ghostin'
'ghostin' is an anagram of 'shoting'.
'shoting' placed around 'o' is 'SHOOTING'.
(Other definitions for shooting that I've seen before include "gun crime" , "sort of star?" , "Using a gun" , "Dashing" , "Firing" .)