Surge (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">surge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Sudden surge' mean 'inrush' so perhaps 'surge' could also mean 'inrush')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for inrush that I've seen before include "Internal thrust" , "Sudden arrival (of people or water?)" , "Rapid flow from outside" , "Overwhelming flow" , "Sudden arrival or entry" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">surge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that onrush is a type of surge)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for onrush that I've seen before include "Swarm" , "Forward surge" , "Attack" , "Career" , "Forward dash" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">surge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that billow is a kind of surge)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for billow that I've seen before include "Wave; upward flow" , "Swell out in the wind" , "Become inflated; rise up, as in waves" , "Swell out, as a flag" , "Swell out (as a sail)" .)
(Another definition for rising tide that I've seen is " between low and high water".)