Praise enthusiastically (5)
I believe the answer is:
extol
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">praise enthusiastically</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 extol that I've seen before include "Magnify" , "Speak well of" , "Praise highly, laud" , "Applaud" , "be lavish with praise" .)