Witness, watch (7)
I believe the answer is:
observe
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">witness</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">watch</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(observing is a kind of watching)</span><br/ ><br/ ></span>
(Other definitions for observe that I've seen before include "monitor" , "Witness, watch" , "Keep - watch" , "taking notice" , "Watch closely" .)