Immersed briefly (6)
I believe the answer is:
dipped
'immersed briefly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dipped that I've seen before include "Briefly submerged" , "Lower beam of headlights" , "Immersed briefly in a liquid" , "Immersed momentarily" , "Went down momentarily" .)