Code word for E (4)
I believe the answer is:
echo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">code word for e</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for echo that I've seen before include "A natural sound reflection" , "In The Maid of the Mountains" , "Be suggestive of" , "Nymph (only able to repeat the last words of others)" , "Greek girl in love with Narcissus" .)