The narrator is the one who counts (6)
I believe the answer is:
teller
I believe this clue is a double definition.
'the narrator' is the first definition.
(I've seen this before)
'the one who counts' is the second definition.
(I've seen this before)
'is' is the link.
(Other definitions for teller that I've seen before include "One who instructs" , "Narrator and bank clerk" , "One records cash" , "Bank official or narrator" , "Counter of votes or a bank employee" .)