Wavelet (6)
I believe the answer is:
ripple
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wavelet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that wavelet can be written as ripple)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ripple that I've seen before include "Type of ice cream with coloured syrup" , "Slight disturbance on water's surface" , "Small wave or surface disturbance" , "Tiny wave; gentle applause" , "Small wave on a liquid's surface" .)