Ebb, go backwards (6)
I believe the answer is:
recede
I believe this is a double definition.
'ebb' is the first definition.
(I know that ebb is a kind of recede)
'go backwards' is the second definition.
(I've seen this before)
(Other definitions for recede that I've seen before include "Withdraw" , "Go backwards" , "Move backward" , "Decree (anag) - ebb" , "Go back, ebb" .)