A bar's wrecked in port (5)
I believe the answer is:
basra
'port' is the definition.
(I have seen 'Iraqi port ' mean 'basra' so perhaps 'port' could also mean 'basra')
'a bar's wrecked in' is the wordplay.
'wrecked' indicates an anagram.
'in' is an insertion indicator.
'bars' anagrammed gives 'bsra'.
'a' placed into 'bsra' is 'BASRA'.
(Other definitions for basra that I've seen before include "South Iraqi oil port" , "Iraq's main port" , "Iraqi port on the Shatt-al-Arab waterway" , "Middle Eastern city" , "City in Iraq" .)