Falling of tide (6)
I believe the answer is:
ebbing
(Other definitions for ebbing that I've seen before include "Going out like a tide" , "Gradually growing less" , "Flowing out" , "Big Ben (anag)" , "in decline?" .)
I believe the answer is:
ebbing
(Other definitions for ebbing that I've seen before include "Going out like a tide" , "Gradually growing less" , "Flowing out" , "Big Ben (anag)" , "in decline?" .)