Follow on (5)
I believe the answer is:
ensue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">follow on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ensue that I've seen before include "Follow as a consequence" , "Follow later" , "Leading directly to" , "Come to pass" , "Come about, result in" .)