Alpha follower (4)
I believe the answer is:
beta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alpha follower</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 beta that I've seen before include "second class grade?" , "Letter before gamma" , "2nd letter of Greek alphabet" , "Greek letter -- second in order of importance" , "It's next after alpha" .)