The hollow sound of success in business (4)
I believe the answer is:
boom
'the hollow sound of success' is the definition.
'boom' can be an answer for 'success'. I'm unsure of the 'the hollow sound of' bit.
'in business' is the wordplay.
'in' becomes 'boo' (I can't justify this - if you can you should believe this answer much more).
'business' becomes 'm' (I've seen this in other clues).
'boo'+'m'='BOOM'
Can you help me to learn more?
(Other definitions for boom that I've seen before include "Loud deep sound" , "Spar - loud noise" , "Harbour barrier" , "Pole on film set" , "become suddenly prosperous" .)