Dip (bread) in soup before eating (4)
I believe the answer is:
dunk
(Other definitions for dunk that I've seen before include "Dip (morsel) in liquid" , "Submerge in liquid" , "Dip (eg, biscuit) in drink" , "Dip (e.g. biscuit in tea)" , "Immerse (a biscuit)" .)