Let go some planes left out of confrontation with guns (9)
I believe the answer is:
firefight
'of confrontation with guns' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'let go some planes left' is the wordplay.
'let go' becomes 'fire' (both can mean to dismiss from a job).
'some planes left' becomes 'fight' (I can't explain this - if you can you should believe this answer much more).
'fire'+'fight'='FIREFIGHT'
'out' acts as a link.
Can you help me to learn more?
(Another definition for firefight that I've seen is " Battle".)