Stupid journey with Marines on the foreign ship (8)
I believe the answer is:
gormless
'stupid' is the definition.
(similar in meaning)
'journey with marines on the foreign ship' is the wordplay.
'journey' becomes 'go' (journey means to go or travel).
'with' says to put letters next to each other.
'marines' becomes 'RM' (abbreviation for 'Royal Marines').
'on' says to put letters next to each other.
'the foreign ship' becomes 'less' (I can't justify this - if you can you should give a lot more credence to this answer).
'go'+'rm'+'less'='GORMLESS'
Can you help me to learn more?
(Other definitions for gormless that I've seen before include "Silly, lacking sense (colloq.)" , "Lacking initiative (informal)" , "Dim-witted" , "Slow" , "Lacking initiative/sense" .)