The French revolutionary regularly ends in debauchery (7)
I believe the answer is:
lechery
'debauchery' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'the french revolutionary regularly ends' is the wordplay.
'the french' becomes 'le' ('the' in French).
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'ends' says to hollow out the word (remove centre letters).
'regularly' with its centre taken out is 'ry'.
'le'+'che'+'ry'='LECHERY'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for lechery that I've seen before include "Unrestrained sexual desire" , "lustfulness" , "Excessive sexual desire" .)