Bachelors and gunners in port (5)
I believe the answer is:
basra
'port' is the definition.
(I know that Basra is a port)
'bachelors and gunners' is the wordplay.
'bachelors' becomes 'bas' (people with Bachelor of Arts degrees).
'and' means one lot of letters go next to another.
'gunners' becomes 'RA' (Royal Artillery).
'bas'+'ra'='BASRA'
'in' is the link.
(Other definitions for basra that I've seen before include "Iraqi city; Arabs (anag.)" , "Iraq's main port" , "Chief port of Iraq" , "City in Iraq" , "Iraqi port on the Shatt-al-Arab waterway" .)