Very eager (4)
(Other definitions for avid that I've seen before include "Keen, enthusiastic" , "Zealous, enthusiastic" , "Excessively keen" , "Fanatical" , "Showing active interest and enthusiasm" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very eager</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for agog that I've seen before include "Eager, avid" , "Enthralled" , "Full of excitement" , "Very far from indifferent" , "In state of wide-eyed expectancy" .)