Convert a message (6)
I believe the answer is:
encode
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">convert a message</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for encode that I've seen before include "Turn message into secret symbols" , "Conceal meaning" , "Make cryptic" , "Convert into a cipher" , "Put into secret writing" .)