Sudden dive (6)
I believe the answer is:
plunge
(Other definitions for plunge that I've seen before include "Dive - submerge" , "'Dive, plummet (6)'" , "Thrust or dive into" , "Take the . . . . . . - jump right in" , "Move suddenly" .)
I believe the answer is:
plunge
(Other definitions for plunge that I've seen before include "Dive - submerge" , "'Dive, plummet (6)'" , "Thrust or dive into" , "Take the . . . . . . - jump right in" , "Move suddenly" .)