Look dead, perhaps, when drunk (6)
I believe the answer is:
loaded
'drunk' is the definition.
(I've seen this before)
'look dead perhaps' is the wordplay.
'look' becomes 'lo' (archaic exclamation meaning 'look!').
'perhaps' indicates an anagram.
'dead' is an anagram of 'aded'.
'lo'+'aded'='LOADED'
'when' acts as a link.
(Other definitions for loaded that I've seen before include "Cavalry sword" , "Rich - drunk - with a heavy burden" , "Charged with ammunition" , "Wealthy (slang) - charged" , "Rolling" .)