Puts out the light, or does us in (6)
I believe the answer is:
douses
'puts out' is the definition.
(dousing is a kind of putting out)
'does us in' is the wordplay.
'in' is an insertion indicator.
'does' placed around 'us' is 'DOUSES'.
'the light or' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for douses that I've seen before include "wets" , "Drenches or extinguishes" , "Puts out fire with water" , "Dips into liquid or extinguishes a light" , "Dips into a liquid or puts out, a candle say" .)