Pass over most recent turbulence at sea (12)
I believe the answer is:
crosscurrent
'turbulence at sea' is the definition.
(type of sea current)
'pass over most recent' is the wordplay.
'pass over' becomes 'cross' (synonyms).
'most recent' becomes 'current'.
'cross'+'current'='CROSSCURRENT'
(Other definitions for crosscurrent that I've seen before include "A tendency in conflict with another" , "Conflicting flow" , "Flow at an angle to the main flow" .)