Major report produced by a VIP (3,5)
I believe the answer is:
big noise
'a vip' is the definition.
(I've seen this before)
'major report produced by' is the wordplay.
'major' becomes 'big' (I've seen this in other clues).
'report' becomes 'noise' (a report is a loud sound like an explosion).
'produced by' says to put letters next to each other.
'big'+'noise'='BIG NOISE'
(Other definitions for big noise that I've seen before include "Important person (colloq.)" , "VIP" , "An important person, sounds loud" , "uproar" , "Important man (colloq.)" .)