Loud noise as heart ripped from chest (4)
I believe the answer is:
boom
'loud noise' is the definition.
(I've seen this before)
'heart ripped from chest' is the wordplay.
'heart ripped from' means to remove the middle letters (the heart or centre is removed).
'chest' becomes 'bosom' (I've seen this before).
'bosom' with its centre taken out is 'BOOM'.
'as' acts as a link.
(Other definitions for boom that I've seen before include "become suddenly prosperous" , "Dull explosion; prosperous period" , "pole attached to sail" , "The noise of increased business activity?" , "Period of prosperity - explosive sound - sailing boat's spar" .)