Stray from a topic
I believe the answer is:
digress
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stray from a topic</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 digress that I've seen before include "Deviate from the main subject" , "Wander from one's path" , "Leave the main subject" , "Be sidetracked" , "Go off the main subject" .)