Revolutionary fellow diverges in oration (3,6)
I believe the answer is:
guy fawkes
'oration' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?
'revolutionary fellow diverges' is the wordplay.
I cannot really see how this works, but
'revolutionary' could be 'fawkes' (Guy Fawkes) and 'fawkes' is found in the answer.
'fellow' could be 'guy' (both can mean a man) and 'guy' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for guy fawkes that I've seen before include "Plotter against James I" , "His effigy is burned on Nov 5th in England" , "assassin" , "17th-century conspirator" , "Gunpowder Plot hatcher" .)