Keenly (7)
I believe the answer is:
eagerly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">keenly</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 eagerly that I've seen before include "With keen anticipation" , "Keenly" , "With hunger" , "In a keen manner" , "Ardently and avidly" .)