Drunk's wound wants a bit of cleansing (5)
I believe the answer is:
oiled
'drunk's' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for oiled that I've seen before include "Lubricated (with drink?)" , "wasted" , "greasy" , "get drunk" , "Anointed" .)