A warning about cigarettes being bad for you? (5,5)
I believe the answer is:
smoke alarm
'bad for you?' is the definition.
The definition suggests a singular noun which matches the answer.
'a warning about cigarettes being' is the wordplay.
'a warning' becomes 'alarm' (I've seen this in another clue).
'about' is a charade indicator (letters next to each other).
'cigarettes being' becomes 'smoke' (I can't justify this - if you can you should believe this answer much more).
'alarm' put after 'smoke' is 'SMOKE ALARM'.
Can you help me to learn more?
(Other definitions for smoke alarm that I've seen before include "Fire detector" , "Device giving warning of fire" , "safety device" , "Device to warn of fire" .)