Magnum follower (4)
I believe the answer is:
opus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">magnum follower</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 opus that I've seen before include "A Latin work" , "Musical piece" , "Artistic work" , "Composer's catalogue number" , "Piece of music (with number)" .)