Good man going to North European breakwater (6)
I believe the answer is:
groyne
'breakwater' is the definition.
('groyne' can be a synonym of 'breakwater')
'good man going to north european' is the wordplay.
'good' becomes 'g' (abbreviation).
'man' becomes 'roy' (I've seen this before**).
'going to' says to put letters next to each other.
'north' becomes 'n' ('N' can be a synonym of 'north').
'european' becomes 'e' (abbreviation e.g. EU).
'g'+'roy'+'n'+'e'='GROYNE'
(Other definitions for groyne that I've seen before include "Anti-erosion breakwater" , "Sea wall" , "Barrier built out into the sea to check erosion" , "Mole" , "(Usually wooden) breakwater" .)