Course that's hard in Notts town (8)
I believe the answer is:
workshop
'course' is the definition.
(I know that workshop is a type of course)
'hard in notts town' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'in' indicates putting letters inside.
'notts town' becomes 'Worksop' (town in Nottinghamshire).
'h' inserted inside 'worksop' is 'WORKSHOP'.
'that's' acts as a link.
(Other definitions for workshop that I've seen before include "Room or building in which work or manufacture is carried on" , "Place where things are made" , "Labour area" , "Atelier" , "Room where goods are manufactured or repaired" .)