Pay heed (6)
I believe the answer is:
attend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pay heed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that pay heed can be written as attend)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for attend that I've seen before include "Be there ? pay attention" , "Being 16 [LISTEN]" , "Be present at, turn up" , "Completed" , "take heed" .)