Bird is flying around in Italian port (8)
I believe the answer is:
Here is my best explanation:
'italian port' is the definition.
(I've seen this before)
'bird is flying around in' is the subsidiary indication.
'flying' is an anagram indicator.
'around' is an insertion indicator.
'birdis' with letters rearranged gives 'brdisi'.
'brdisi' placed around 'in' is 'brindisi'.
(Other definitions for brindisi that I've seen before include "Ibis rind (anag) - Italian port", "Italian drinking song", "Southeast Italian port", "Song that goes with drinking", "toast of some Italians" and "Italian port on the Adriatic".)