Carried north in tidal wave (5)
I believe the answer is:
borne
'carried' is the definition.
(I've seen this before)
'north in tidal wave' is the wordplay.
'north' becomes 'n' ('N' can be a synonym of 'north').
'in' means one lot of letters goes inside another.
'tidal wave' becomes 'bore' (I've seen this before).
'n' put inside 'bore' is 'BORNE'.
(Other definitions for borne that I've seen before include "Carried, conveyed" , "Carried or endured" , "Produced" .)