Follower; sticking (8)
I believe the answer is:
adherent
I believe this clue is a double definition.
'follower' is the first definition.
(I know that adherent is a type of follower)
'sticking' is the second definition.
(I've seen this before)
(Other definitions for adherent that I've seen before include "One supports" , "supporter of party" , "Staunch follower" , "Loyal follower - sticks close" , "Dedicated supporter" .)