Run off romantically (5)
I believe the answer is:
elope
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">run off romantically</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for elope that I've seen before include "Run away to Gretna Green?" , "(Lovers) run away" , "Bolt" , "Run away to wed" , "Flee to wed" .)