Cover Irish return to island (5)
I believe the answer is:
capri
'to island' is the definition.
(Italian island)
'cover irish return' is the wordplay.
'cover' becomes 'cap' (cap is a kind of cover).
'irish' becomes 'IR' (abbreviation).
'return' says the letters should be written backwards.
'ir' backwards is 'ri'.
'cap'+'ri'='CAPRI'
(Other definitions for capri that I've seen before include "Neapolitan isle" , "Island in the Gulf of Naples" , "found in Tyrrhenian location" , "I carp about the island" , "Italian resort island, once home to Gracie Fields" .)