Wed on the sly (5)
I believe the answer is:
elope
'wed on the sly' 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 "Run away to get married" , "run off with another?" , "(Lovers) run away" , "Flee to wed" , "Run off with Mr/Ms Right" .)