Sudden increase (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden increase</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for upsurge that I've seen before include "Sudden rapid increase" , "Sudden or abrupt strong increase" , "Sudden forceful flow from below" , "Effect of groundswell" , "Rapid rise" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden increase</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a surge is a sudden increase in something)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for surge that I've seen before include "Powerful rush (of emotion)" , "Sudden flow" , "Sudden onward motion" , "Sudden powerful increase" , "significant increase" .)