Be effusive (4)
I believe the answer is:
gush
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be effusive</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gush that I've seen before include "Pour forth" , "Flood out - enthuse" , "Effuse" , "Outburst" , "Spout like geyser" .)