Run away to wed (5)
I believe the answer is:
elope
'run away to wed' 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 Gretna Green?" , "Run away secretly to marry" , "leave with lover" , "Run away to wed" , "Run away to get married" .)