Snuff out of metal box good for everyone? Rather! (10)
I believe the answer is:
extinguish
'snuff out' is the definition.
(synonyms)
'metal box good for everyone? rather' is the wordplay.
I cannot quite understand how this works, but
'metal' could be 'ti' (Ti is an example) and 'ti' is found in the answer.
'good' could be 'g' (abbreviation) and 'g' is located in the answer.
'for everyone?' could be 'u' (Universal film certificate) and 'u' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for extinguish that I've seen before include "Quench" , "Stop" , "Put out (a light/fire)" .)