Fighter jet's broken flap (7)
I believe the answer is:
tornado
'fighter' is the definition.
(tornado can mean a violent person)
'jet's broken flap' is the wordplay.
'jet's broken' becomes 'torn' (I can't justify this - if you can you should believe this answer much more).
'flap' becomes 'ado' (I've seen this before).
'torn'+'ado'='TORNADO'
Can you help me to learn more?
(Other definitions for tornado that I've seen before include "It's a big blow" , "Windy hazard" , "A violent and destructive whirlwind" , "Major storm" , "Rapidly whirling column of air" .)