Hitch in haste (5)
I believe the answer is:
elope
'hitch 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 "Run away to wed" , "Run away together" , "run off with another?" , "do a moonlight flit" , "Run away in secret" .)