### Clue: Furious when flower head is knocked off by branches (2,2,4)
### Answer: UP IN ARMS 
 ### Explanation: Definition: Furious 
 "lupin"(flower of the lupinus genus of plants) **minus its 1st letter**(head is knocked off) **placed above**(by/attached to, in a down clue) ARMS(branches of a wider organisation, as in "branches of the military").