Officially endorse (7)
I believe the answer is:
approve
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">officially endorse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for approve that I've seen before include "permit" , "Regard with favour" , "Deem satisfactory" , "Commend, endorse" , "Say yes to" .)