A man partisan leaders fool (7)
I believe the answer is:
patrick
'a man' is the definition.
'partisan leaders fool' is the wordplay.
'partisan leaders' becomes 'pa' (I can't explain this - if you can you should believe this answer much more).
'fool' becomes 'trick' (I've seen this before).
'pa'+'trick'='PATRICK'
Can you help me to learn more?
(Other definitions for patrick that I've seen before include "Irish patron saint" , "Patron saint who said 'Shoo!' to serpents" , "Name" , "- - Swayze: film actor" , "-- Moore, astronomer" .)