Epsilon follower (4)
I believe the answer is:
zeta
'epsilon follower' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for zeta that I've seen before include "Welsh actress, Catherine __-Jones, b. 1969" , "Greek letter (for Catherine Jones?)" , "Foreign character" , "Greek character" , "Sixth letter of the Greek alphabet" .)