Coming from the south, I'm not impressed about French leaders being gallant (7)
I believe the answer is:
heroism
'gallant' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'coming from the south i'm not impressed about french leaders' is the wordplay.
'coming from the south' is a reversal indicator (in a down clue, letters go up).
'i'm not impressed' becomes 'meh' (I've seen this in another clue).
'about' indicates putting letters inside.
'french leaders' becomes 'rois' (I can't justify this - if you can you should give a lot more credence to this answer).
'meh' reversed gives 'hem'.
'hem' going around 'rois' is 'HEROISM'.
'being' acts as a link.
Can you help me to learn more?
(Other definitions for heroism that I've seen before include "Very brave conduct or act of valour" , "Outstanding courage" , "Is Homer involved in brave behaviour?" , "brave action" , "Courageous quality" .)