Goes through the tidal floods (5)
I believe the answer is:
bores
This clue might be a double definition.
'goes' is the first definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.
'the tidal floods' is the second definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?
'through' is the link.
Can you help me to learn more?
(Other definitions for bores that I've seen before include "Dull tedious talkers" , "Tedious people or drills" , "Drills or wearies" , "Makes a hole with a pointed tool" .)