Gamma follower (5)
I believe the answer is:
delta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gamma 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 delta that I've seen before include "Alluvial river mouth" , "Nile river mouth" , "Coastal feature" , "Roughly triangular area of alluvial deposits" , "Branching river mouth" .)