Irish islands (4)
I believe the answer is:
aran
'irish islands' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aran that I've seen before include "Irish style of knitwear" , "traditional type of knitwear" , "Irish islands" , "islands near 9 [GALWAY]" , "-- Islands; -- sweater" .)