Zapata? A revolutionary led by original bit of thinking! (5)
I believe the answer is:
tache
'original bit of thinking' is the definition.
The definition suggests a singular noun which matches the answer.
'zapata? a revolutionary led by' is the wordplay.
'zapata?' becomes 'ta' (I am not sure about this - if you are sure you should believe this answer much more).
'a revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'led by' is a charade indicator (letters next to each other) (some letters go in front of others).
'ta'+'che'='TACHE'
Can you help me to learn more?
(Other definitions for tache that I've seen before include "show on one's face" , "Some bristles" , "facial hair" , "Whiskers (informal)" , "Facial ornament" .)