He counts and recounts (6)
I believe the answer is:
teller
'he counts and recounts' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for teller that I've seen before include "one who counts" , "Bank cashier or narrator of story" , "One records cash" , "who worked on the hydrogen bomb" , "one reckons" .)