Rug flaw affected battle of 1990 (4,3)
I believe the answer is:
gulf war
'battle of 1990' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'rug flaw affected' is the wordplay.
'affected' is an anagram indicator.
'rug'+'flaw'='rugflaw'
'rugflaw' is an anagram of 'GULF WAR'.
Can you help me to learn more?
(Other definitions for gulf war that I've seen before include "First armed conflict between USA and Saddam Hussein" , "Hostilities in 1991" .)