Poet dispensing with uniform in Arabian port (4)
I believe the answer is:
aden
'arabian port' is the definition.
(I've seen this in another clue)
'poet dispensing with uniform' is the wordplay.
'poet' becomes 'Auden' (WH Auden, 1907-1973).
'dispensing with' indicates named letters should be taken away.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'auden' with 'u' taken away is 'ADEN'.
'in' is the link.
(Other definitions for aden that I've seen before include "Red Sea port" , "Main port of Yemen" , "foreign climes" , "Yemeni port" , "Commercial capital of Yemen" .)