A sailor welcomes monarch to a Middle Eastern port (5)
I believe the answer is:
aqaba
'port' is the definition.
(I've seen this before)
'a sailor welcomes monarch to a middle eastern' is the wordplay.
'a sailor' becomes 'ab' (abbreviation for able seaman).
'welcomes' means one lot of letters goes inside another (in sense of 'invites in').
'monarch' becomes 'Q' (chess abbreviation).
'to' says to put letters next to each other.
'middle eastern' becomes 'a' (I can't explain this - if you can you should give a lot more credence to this answer).
'q'+'a'='qa'
'ab' placed around 'qa' is 'aqab'.
'aqab'+'a'='AQABA'
Can you help me to learn more?
(Other definitions for aqaba that I've seen before include "Jordanian port" , "Gulf in Red Sea" , "Part of Jordan" , "Asian port" , "Jordan's port" .)