Wed on the run (5)
I believe the answer is:
elope
'wed on the run' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elope that I've seen before include "go off to the match?" , "Do a runner" , "Run away secretly to marry" , "Run away in secret" , "do a moonlight flit" .)