Immersed (6)
I believe the answer is:
dipped
'immersed' is the definition.
(dipping is a kind of immersing)
This is the entire clue.
(Other definitions for dipped that I've seen before include "Briefly submerged" , "Dropped downward" , "Lower beam of headlights" , "Immersed briefly in a liquid" , "Immersed momentarily" .)