Drink flows covering hangover's last shocks (9)
I believe the answer is:
surprises
'shocks' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for surprises that I've seen before include "Takes unawares" , "unexpected things of life" , "Astonishes" , "bowls over" , "Shocks" .)