Fell — drop (3,4)
I believe the answer is:
cut down
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">fell</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">drop</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for cut down that I've seen before include "Felled" , "Fell a tree or reduce usage as in a diet" , "Reduce the length of" , "Economise or despatch with sword" .)