Fall away, decline (3)
I believe the answer is:
ebb
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">fall away</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">decline</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(ebb is a kind of decline)</span><br/ ><br/ ></span>
(Other definitions for ebb that I've seen before include "Tidal retreat" , "Withdraw heartless" , "Fall back" , "Type of tide" , "Drain away; decline" .)