Move men on board east of recently introduced port (9)
I believe the answer is:
newcastle
'port' is the definition.
(I've seen this before)
'move men on board east of recently introduced' is the wordplay.
I cannot quite understand how this works, but
'move' could be 'castle' (castling is a kind of moving) and 'castle' is present in the answer.
'east' could be 'e' (abbreviation) and 'e' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for newcastle that I've seen before include "English city" , "town" , "Man City?" , "port for England" , "City on the Tyne" .)