For gas, maybe, but smoke can get through it (4)
I believe the answer is:
pipe
'for gas maybe but smoke' is the definition.
I can't judge whether this defines the answer.
'get through it' is the wordplay.
'get' is a charade indicator (letters next to each other).
'through' becomes 'pip' (I can't justify this - if you can you should give a lot more credence to this answer).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'pip' put next to 'e' is 'PIPE'.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for pipe that I've seen before include "chanter" , "Fluid or gas transporter" , "Utter shrilly; wine cask" , "Tobacco is smoked in it" , "Long tube" .)