Quiet spell (4)
I believe the answer is:
lull
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quiet spell</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 lull that I've seen before include "Calm; allay (fears)" , "Short period of calm" , "Soothe, calm" , "Rock to sleep" , "Calm interval in storm" .)