Furious patron -- what he condemned (2,3,7)
I believe the answer is:
on the warpath
'furious' is the definition.
(someone on the warpath is very angry)
'patron what he condemned' is the wordplay.
'condemned' indicates anagramming the letters.
'patron'+'what'+'he'='patronwhathe'
'patronwhathe' anagrammed gives 'ON THE WARPATH'.
(Other definitions for on the warpath that I've seen before include "In a belligerent mood" , "Having a hostile attitude" , "angry" , "Where you might find the brave" , "In a mood for battle" .)