Dunk, submerge (7)
I believe the answer is:
immerse
This clue is a double definition.
'dunk' is the first definition.
(I know that dunk is a more specific form of the action immerse)
'submerge' is the second definition.
(I know that submerge is a more specific form of the action immerse)
(Other definitions for immerse that I've seen before include "Engage deeply" , "Submerge in water as once for baptism" , "Cover with water, dip into" , "Drown" , "Engross" .)