Marry in haste (5)
I believe the answer is:
elope
'marry in haste' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elope that I've seen before include "Bolt" , "(Lovers) run away" , "Run away with lover" , "Abscond for amorous purposes" , "Run off with Mr/Ms Right" .)