One of those points of great danger heroic Frenchman's between (9)
I believe the answer is:
epicentre
'one' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'those points of great danger heroic frenchman's between' is the wordplay.
I cannot really understand how this works, but
'points' could be 'en' (compass points east and north) and 'en' is present in the answer.
'great' could be 'epic' (I've seen this in another clue) and 'epic' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for epicentre that I've seen before include "Shakiest point" , "Earthquake's surface location" , "Focus of activity" , "most shocking point" , "a very disturbed place" .)