Not wholly great to follow a madman to get spice (6)
I believe the answer is:
nutmeg
'spice' is the definition.
(nutmeg is a kind of spice)
'not wholly great to follow a madman' is the wordplay.
'not wholly' means to remove the last letter.
'great' becomes 'mega' (I've seen this in other clues).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'follow a madman' becomes 'nut' (I can't explain this - if you can you should believe this answer much more).
'mega' with its last letter removed is 'meg'.
'meg' after 'nut' is 'NUTMEG'.
'to get' acts as a link.
Can you help me to learn more?
(Other definitions for nutmeg that I've seen before include "Spicy seasoning - hard fruit for little Margaret?" , "Kick the football between an opponent's legs" , "Hard seed used as seasoning" , "Spice to grate" , "One grated as spice" .)