Gangster carrying gun round, warning to get out (4,5)
I believe the answer is:
fire alarm
'warning to get out' is the definition.
I can't judge whether this definition defines the answer.
'gangster carrying gun' is the wordplay.
'gangster' becomes 'al' (Al Capone).
'carrying' is an insertion indicator.
'gun' becomes 'firearm' (firearm is a kind of gun).
'al' inserted into 'firearm' is 'FIRE-ALARM'.
'round' is the link.
Can you help me to learn more?
(Other definitions for fire alarm that I've seen before include "Safety equipment" , "Warning device" , "Warning sound" , "Warning to evacuate" , "Warner" .)