Unruly Arabs in Iraqi port (5)
I believe the answer is:
basra
'iraqi port' is the definition.
(I've seen this before)
'unruly arabs' is the wordplay.
'unruly' indicates anagramming the letters.
'arabs' with letters rearranged gives 'BASRA'.
'in' acts as a link.
(Other definitions for basra that I've seen before include "South Iraqi oil port" , "Middle Eastern city" , "Chief port of Iraq" , "Iraqi port city" , "Iraqi city; Arabs (anag.)" .)