Fa follower (3)
I believe the answer is:
sol
'fa follower' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sol that I've seen before include "Note; Peruvian currency" , "Mexican lager" , "Peruvian currency; Roman sun god" , "Spanish and poetic sun" , "The sun in 12 Across" .)