Pedant, fusspot (8)
I believe the answer is:
stickler
This clue is a double definition.
'pedant' is the first definition.
(a pedant is a stickler for detail)
'fusspot' is the second definition.
(I've seen this before)
(Other definitions for stickler that I've seen before include "One who insists on something, like punctuality" , "Pernickety person" , "Nit-picker" , "Trickles for someone who insists" , "Someone fastidious" .)