Suffer consequences of poison gas at mine (3,2)
I believe the answer is:
cop it
'suffer consequences of poison' is the definition.
I know nothing about this answer so I can't judge whether this works.
'gas at mine' is the wordplay.
'gas' becomes 'co' (CO is carbon monoxide).
'at' is a charade indicator (letters next to each other).
'mine' becomes 'pit' (down the pit).
'co'+'pit'='COP IT'
Can you help me to learn more?
(Other definitions for cop it that I've seen before include "Suffer the consequences!" , "Get into trouble; be killed" , "Be punished" , "Get it in the neck" , ""get in loads of trouble!"" .)