Carried in tidal flood (4)
I believe the answer is:
bore
I believe this clue is a double definition.
'carried' is the first definition.
(I've seen this in another clue)
'tidal flood' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for bore that I've seen before include "I go on" , "Dull person; hole" , "Pierce or tire with tedium" , "Weary with tediousness" , "Capable of being shifted" .)