In France, from a port in Yemen, initially decide this is where we must stop (4,3)
I believe the answer is:
dead end
This might be a double definition.
'in france from a port in yemen initially decide this is where we must' is the first definition.
The definition suggests a singular noun which matches the answer.
'stop' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for dead end that I've seen before include "A blind alley, point of no further progress" , "that's leading nowhere" , "Blind alley or situation without prospects" , "Blind alley, closed passage" , "Situation with no way forward" .)