New part of the course? (5)
I believe the answer is:
green
'new' is the definition.
(I've seen this in another clue)
'part of the course?' is the wordplay.
'part of' becomes 'gree' (I can't explain this - if you can you should believe this answer much more).
'the course?' becomes 'n'.
'gree'+'n'='GREEN'
Can you help me to learn more?
(Other definitions for green that I've seen before include "Verdant; naive" , "Gullible" , "raw, as > part of course" , "17's colour" , "Grassy area; naive" .)