Chaotic melees outside the front of rowdy supermarket in Ireland (7,4)
I believe the answer is:
emerald isle
'ireland' is the definition.
(synonyms)
'chaotic melees outside the front of rowdy supermarket' is the wordplay.
'chaotic' indicates anagramming the letters.
'outside' indicates putting letters inside (some letters go outside others).
'the front of' suggests taking the first letters (the letter at the front of the word).
'supermarket' becomes 'Aldi' (Aldi is a supermarket chain).
The first letter of 'rowdy' is 'r'.
'melees' anagrammed gives 'emesle'.
'r'+'aldi'='raldi'
'emesle' going around 'raldi' is 'EMERALD ISLE'.
'in' is the link.
(Other definitions for emerald isle that I've seen before include "divided country" , "where one might get whiskey" , "jewel of a place" , "Name for Ireland" .)