Drop down after washing up? (3)
I believe the answer is:
ebb
'drop' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ebb that I've seen before include "Go out or recede like tide" , "(Water) recede" , "Abate" , "Tidal outflow" , "Withdraw heartless" .)