Letter before chi (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">letter before chi</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for phi that I've seen before include "Greek letter, equivalent to F" , "Greek character" , "Letter from the Balkans" , "21st Greek letter" , "Greek letter; hip (anag.)" .)