From the Emerald Isle (5)
I believe the answer is:
irish
'from the emerald isle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for irish that I've seen before include "Native to Erin" , "From Dublin maybe" , "From Dublin, perhaps" , "Hi, Sir, ar you a Celt?" , "Like Wilde or Yeats" .)