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 can't justify this - if you can you should give a lot more credence to this answer).
'a revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'led by' says to put 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" .)