With great speed or immediacy (9)
I believe the answer is:
posthaste
(Other definitions for posthaste that I've seen before include "Express" , "Like Bat out of Hell" , "With great speed, like delivery of letters?" , "Quick" , "Speedily" .)
I believe the answer is:
posthaste
(Other definitions for posthaste that I've seen before include "Express" , "Like Bat out of Hell" , "With great speed, like delivery of letters?" , "Quick" , "Speedily" .)